diff --git a/data/uking_functions.csv b/data/uking_functions.csv
index 1770d702..fca7e3e5 100644
--- a/data/uking_functions.csv
+++ b/data/uking_functions.csv
@@ -381,8 +381,8 @@ Address,Quality,Size,Name
 0x0000007100009d70,U,000372,PlayerOrEnemy::rtti1impl
 0x0000007100009ee4,U,000140,
 0x0000007100009f70,U,000140,
-0x0000007100009ffc,U,000140,_ZNK4sead15RuntimeTypeInfo6DeriveINS_4HeapEE9isDerivedEPKNS0_9InterfaceE
-0x000000710000a088,U,000140,_ZNK4sead15RuntimeTypeInfo6DeriveINS_15ResourceFactoryEE9isDerivedEPKNS0_9InterfaceE
+0x0000007100009ffc,U,000140,
+0x000000710000a088,U,000140,
 0x000000710000a114,U,000316,CookResult::construct
 0x000000710000a250,O,000384,_ZN4ksys8CookItemC1Ev
 0x000000710000a3d0,U,000532,
@@ -506,7 +506,7 @@ Address,Quality,Size,Name
 0x0000007100012610,O,000468,_ZNK4sead14SafeStringBaseIcE9findIndexERKS1_
 0x00000071000127e4,U,000336,_ZN4sead18Matrix34CalcCommonIfE7inverseERNS_9BaseMtx34IfEERKS3_
 0x0000007100012934,O,000004,_ZN4sead21FormatFixedSafeStringILi128EED0Ev
-0x0000007100012938,O,000240,_ZN4sead15FixedSafeStringILi128EEaSERKNS_14SafeStringBaseIcEE
+0x0000007100012938,U,000240,
 0x0000007100012a28,U,000600,
 0x0000007100012c80,U,000068,Enemy::construct
 0x0000007100012cc4,U,000044,
@@ -1008,7 +1008,7 @@ Address,Quality,Size,Name
 0x0000007100031314,U,000204,
 0x00000071000313e0,U,000092,
 0x000000710003143c,U,000204,
-0x0000007100031508,U,000092,_ZNK4sead14MainFileDevice18getRuntimeTypeInfoEv
+0x0000007100031508,U,000092,
 0x0000007100031564,U,000104,
 0x00000071000315cc,U,000004,j_nullsub_62
 0x00000071000315d0,U,000036,_ZN3agl3pfx12DepthOfFieldD0Ev
@@ -2400,7 +2400,7 @@ Address,Quality,Size,Name
 0x00000071000800bc,O,000240,_ZN4sead19FixedSafeStringBaseIcLi256EEaSERKNS_14SafeStringBaseIcEE
 0x00000071000801ac,U,000060,_ZN4sead18HeapSafeStringBaseIcED0Ev
 0x00000071000801e8,U,000004,j__ZdlPv_31
-0x00000071000801ec,U,000240,_ZN4sead15FixedSafeStringILi32EEaSERKNS_14SafeStringBaseIcEE
+0x00000071000801ec,U,000240,_ZN4sead15FixedSafeStringILi128EEaSERKNS_14SafeStringBaseIcEE
 0x00000071000802dc,U,000024,
 0x00000071000802f4,U,000140,
 0x0000007100080380,U,000104,HavokActiveObject::construct
@@ -4913,7 +4913,7 @@ Address,Quality,Size,Name
 0x00000071000e1d48,O,000288,_ZNK5uking6action16ControllerRumble27checkDerivedRuntimeTypeInfoEPKN4sead15RuntimeTypeInfo9InterfaceE
 0x00000071000e1e68,O,000092,_ZNK5uking6action16ControllerRumble18getRuntimeTypeInfoEv
 0x00000071000e1ec4,O,000052,_ZN5uking6action16ControllerRumbleD0Ev
-0x00000071000e1ef8,O,000356,_ZNK4ksys3act2ai10ActionBase19getDynamicParamImplIPiEEbPT_RKN4sead14SafeStringBaseIcEEMNS1_9ParamPackEKFbS6_SB_ES6_
+0x00000071000e1ef8,U,000356,
 0x00000071000e205c,U,000060,
 0x00000071000e2098,O,000076,_ZN5uking6action18CopyMapPinPositionC1ERKN4ksys3act2ai10ActionBase7InitArgE
 0x00000071000e20e4,O,000020,_ZN5uking6action18CopyMapPinPositionD1Ev
@@ -13053,7 +13053,7 @@ Address,Quality,Size,Name
 0x00000071001ed4a8,O,000288,_ZNK5uking6action26Msg2CameraResetInterpolate27checkDerivedRuntimeTypeInfoEPKN4sead15RuntimeTypeInfo9InterfaceE
 0x00000071001ed5c8,O,000092,_ZNK5uking6action26Msg2CameraResetInterpolate18getRuntimeTypeInfoEv
 0x00000071001ed624,O,000052,_ZN5uking6action26Msg2CameraResetInterpolateD0Ev
-0x00000071001ed658,O,000356,_ZNK4ksys3act2ai10ActionBase19getDynamicParamImplIPfEEbPT_RKN4sead14SafeStringBaseIcEEMNS1_9ParamPackEKFbS6_SB_ES6_
+0x00000071001ed658,U,000356,
 0x00000071001ed7bc,U,000060,
 0x00000071001ed7f8,O,000048,_ZN5uking6action24Msg2CameraResetNoConnectC1ERKN4ksys3act2ai10ActionBase7InitArgE
 0x00000071001ed828,U,000108,_ZN5uking6action24Msg2CameraResetNoConnect8oneShot_Ev
@@ -18224,7 +18224,7 @@ Address,Quality,Size,Name
 0x00000071002a5908,U,000088,
 0x00000071002a5960,U,000088,
 0x00000071002a59b8,U,000088,
-0x00000071002a5a10,O,000356,_ZNK4ksys3act2ai10ActionBase19getDynamicParamImplIPbEEbPT_RKN4sead14SafeStringBaseIcEEMNS1_9ParamPackEKFbS6_SB_ES6_
+0x00000071002a5a10,U,000356,
 0x00000071002a5b74,U,000060,
 0x00000071002a5bb0,U,000356,
 0x00000071002a5d14,U,000060,
@@ -46194,14 +46194,14 @@ Address,Quality,Size,Name
 0x00000071007151dc,U,000092,
 0x0000007100715238,U,000428,octarockTypeEnum_text
 0x00000071007153e4,U,000004,j__ZdlPv_308
-0x00000071007153e8,U,000240,_ZN4sead15FixedSafeStringILi16EEaSERKNS_14SafeStringBaseIcEE
+0x00000071007153e8,U,000240,
 0x00000071007154d8,U,000004,j__ZdlPv_309
-0x00000071007154dc,U,000240,_ZN4sead15FixedSafeStringILi224EEaSERKNS_14SafeStringBaseIcEE
+0x00000071007154dc,U,000240,
 0x00000071007155cc,U,000428,octarockWigTypeEnum_text
 0x0000007100715778,U,000004,j__ZdlPv_310
-0x000000710071577c,U,000240,_ZN4sead19FixedSafeStringBaseIcLi224EEaSERKNS_14SafeStringBaseIcEE
+0x000000710071577c,U,000240,
 0x000000710071586c,U,000004,j__ZdlPv_311
-0x0000007100715870,U,000240,_ZN4sead15FixedSafeStringILi1024EEaSERKNS_14SafeStringBaseIcEE
+0x0000007100715870,U,000240,
 0x0000007100715960,U,000124,
 0x00000071007159dc,U,000068,
 0x0000007100715a20,U,000284,
@@ -49439,9 +49439,9 @@ Address,Quality,Size,Name
 0x00000071007d0304,U,000008,uking::StageSelect::moveReenter
 0x00000071007d030c,U,000428,_ZN4sead16RegionLanguageID5text_Ei
 0x00000071007d04b8,U,000004,j__ZdlPv_354
-0x00000071007d04bc,O,000240,_ZN4sead15FixedSafeStringILi24EEaSERKNS_14SafeStringBaseIcEE
+0x00000071007d04bc,U,000240,
 0x00000071007d05ac,U,000004,j__ZdlPv_355
-0x00000071007d05b0,U,000240,_ZN4sead15FixedSafeStringILi96EEaSERKNS_14SafeStringBaseIcEE
+0x00000071007d05b0,U,000240,
 0x00000071007d06a0,U,000004,j__ZdlPv_356
 0x00000071007d06a4,U,000040,
 0x00000071007d06cc,U,000024,
@@ -52900,7 +52900,7 @@ Address,Quality,Size,Name
 0x000000710089c240,U,000012,
 0x000000710089c24c,U,000008,
 0x000000710089c254,U,000076,
-0x000000710089c2a0,U,000204,_ZNK4sead13CalculateTask27checkDerivedRuntimeTypeInfoEPKNS_15RuntimeTypeInfo9InterfaceE
+0x000000710089c2a0,U,000204,
 0x000000710089c36c,U,000092,
 0x000000710089c3c8,U,000004,j__ZdlPv_384
 0x000000710089c3cc,U,000140,
@@ -54547,7 +54547,7 @@ Address,Quality,Size,Name
 0x00000071009160bc,U,000300,
 0x00000071009161e8,U,000476,
 0x00000071009163c4,U,000420,
-0x0000007100916568,U,000224,_ZN4sead21FormatFixedSafeStringILi64EEC2EPKcz
+0x0000007100916568,U,000224,_ZN4sead21FormatFixedSafeStringILi96EEC2EPKcz
 0x0000007100916648,U,000384,
 0x00000071009167c8,U,000044,SaveSystem::setGdmFlagsBeforeStageGen
 0x00000071009167f4,U,000004,SaveSystem::noop
@@ -61772,11 +61772,11 @@ Address,Quality,Size,Name
 0x0000007100aa9ac4,U,000168,
 0x0000007100aa9b6c,U,005076,
 0x0000007100aaaf40,U,000004,j__ZdlPv_576
-0x0000007100aaaf44,U,000244,_ZN4sead15FixedSafeStringILi168EEaSERKNS_14SafeStringBaseIcEE
+0x0000007100aaaf44,U,000244,
 0x0000007100aab038,U,000004,j__ZdlPv_577
-0x0000007100aab03c,U,000244,_ZN4sead19FixedSafeStringBaseIcLi168EEaSERKNS_14SafeStringBaseIcEE
+0x0000007100aab03c,U,000244,
 0x0000007100aab130,U,000004,j__ZdlPv_578
-0x0000007100aab134,U,000244,_ZN4sead15FixedSafeStringILi12EEaSERKNS_14SafeStringBaseIcEE
+0x0000007100aab134,U,000244,
 0x0000007100aab228,U,000004,nullsub_3124
 0x0000007100aab22c,U,000080,
 0x0000007100aab27c,U,001404,getSoundNumberForStage
@@ -63797,7 +63797,7 @@ Address,Quality,Size,Name
 0x0000007100b1cac4,O,000092,_ZN4sead7Color4f4lerpERKS0_S2_f
 0x0000007100b1cb20,O,000060,_ZN4sead7Color4fpLERKS0_
 0x0000007100b1cb5c,O,000060,_ZN4sead7Color4fmLERKS0_
-0x0000007100b1cb98,m,000044,_ZN4seadmlERKNS_8Color4u8Ef
+0x0000007100b1cb98,U,000044,
 0x0000007100b1cbc4,O,000036,_ZN4seadplERKNS_7Color4fES2_
 0x0000007100b1cbe8,O,000036,_ZN4seadmlERKNS_7Color4fES2_
 0x0000007100b1cc0c,O,000032,_ZN4seadmlERKNS_7Color4fEf
@@ -67871,7 +67871,7 @@ Address,Quality,Size,Name
 0x0000007100be2ee0,U,000036,
 0x0000007100be2f04,U,000208,
 0x0000007100be2fd4,U,000004,j__ZdlPv_759
-0x0000007100be2fd8,U,000244,_ZN4sead19FixedSafeStringBaseIcLi24EEaSERKNS_14SafeStringBaseIcEE
+0x0000007100be2fd8,U,000244,
 0x0000007100be30cc,U,000092,_ZN3eui9PictureExC2EPKN2nn4ui2d10ResPictureES5_RKNS2_11BuildArgSetE
 0x0000007100be3128,U,000064,_ZN3eui8WindowExC1ERKS0_
 0x0000007100be3168,U,000036,
@@ -69228,7 +69228,7 @@ Address,Quality,Size,Name
 0x0000007100c2cb2c,U,000012,
 0x0000007100c2cb38,U,000012,
 0x0000007100c2cb44,U,000260,
-0x0000007100c2cc48,U,000200,_ZN3agl3utl14ParameterCurveILj1EE4copyERKNS0_13ParameterBaseE
+0x0000007100c2cc48,U,000200,
 0x0000007100c2cd10,U,000192,
 0x0000007100c2cdd0,U,000344,
 0x0000007100c2cf28,U,000008,
@@ -71107,7 +71107,7 @@ Address,Quality,Size,Name
 0x0000007100cb2208,L,000068,_ZNK2nn3nex7qResult7IsErrorEv
 0x0000007100cb224c,L,000008,
 0x0000007100cb2254,L,000288,
-0x0000007100cb2374,L,000008,_ZN4sead5Mutex6unlockEv
+0x0000007100cb2374,L,000008,
 0x0000007100cb237c,L,000020,_ZN2nn3nex9Condition6NotifyEv
 0x0000007100cb2390,L,000068,_ZN2nn3nex10RootObjectnwEmPKcj
 0x0000007100cb23d4,L,000024,_ZN2nn3nex11LockCheckerD0Ev
diff --git a/tools/viking/src/functions.rs b/tools/viking/src/functions.rs
index db9830ed..36385ad1 100644
--- a/tools/viking/src/functions.rs
+++ b/tools/viking/src/functions.rs
@@ -1,7 +1,10 @@
 use crate::repo;
 use anyhow::{bail, ensure, Context, Result};
 use rustc_hash::FxHashMap;
-use std::path::{Path, PathBuf};
+use std::{
+    collections::HashSet,
+    path::{Path, PathBuf},
+};
 
 pub enum Status {
     Matching,
@@ -84,6 +87,7 @@ pub fn get_functions_for_path(csv_path: &Path) -> Result<Vec<Info>> {
     let mut result = Vec::with_capacity(110_000);
     let mut record = csv::StringRecord::new();
     let mut line_number = 1;
+    let mut num_names = 0;
     if reader.read_record(&mut record)? {
         // Verify that the CSV has the correct format.
         ensure!(record.len() == 4, "invalid record; expected 4 fields");
@@ -98,12 +102,36 @@ pub fn get_functions_for_path(csv_path: &Path) -> Result<Vec<Info>> {
     }
 
     while reader.read_record(&mut record)? {
-        result.push(
-            parse_function_csv_entry(&record)
-                .with_context(|| format!("failed to parse CSV record at line {}", line_number))?,
-        );
+        let entry = parse_function_csv_entry(&record)
+            .with_context(|| format!("failed to parse CSV record at line {}", line_number))?;
+
+        if !entry.name.is_empty() {
+            num_names += 1;
+        }
+
+        result.push(entry);
         line_number += 1;
     }
+
+    // Check for duplicate names in the CSV.
+    let mut known_names = HashSet::with_capacity(num_names);
+    let mut duplicates = Vec::new();
+    for entry in &result {
+        if entry.is_decompiled() && entry.name.is_empty() {
+            bail!(
+                "function at {:016x} is marked as O/M/m but has an empty name",
+                entry.addr | ADDRESS_BASE
+            );
+        }
+
+        if !entry.name.is_empty() && !known_names.insert(&entry.name) {
+            duplicates.push(&entry.name);
+        }
+    }
+    if !duplicates.is_empty() {
+        bail!("found duplicates: {:#?}", duplicates);
+    }
+
     Ok(result)
 }