diff --git a/src/Inputs.ts b/src/Inputs.ts
index f3eabff6..84111803 100644
--- a/src/Inputs.ts
+++ b/src/Inputs.ts
@@ -1,6 +1,6 @@
 import * as URI from "urijs";
 import * as lodash from "lodash";
-import { Map, List } from "immutable";
+import { Map, List, Set } from "immutable";
 import { getStream } from "./get-stream";
 import { Readable } from "stream";
 
@@ -17,7 +17,7 @@ function toReadable(source: string | Readable): Readable {
     return typeof source === "string" ? stringToStream(source) : source;
 }
 
-export async function toString(source: string | Readable): Promise<string> {
+async function toString(source: string | Readable): Promise<string> {
     return typeof source === "string" ? source : await getStream(source);
 }
 
@@ -121,10 +121,6 @@ export class InputData {
         return Map(this._graphQLs);
     }
 
-    get schemaSources(): List<[uri.URI, SchemaTypeSource]> {
-        return this._schemaSources;
-    }
-
     // Returns whether we need IR for this type source
     private async addOtherTypeSource(source: TypeSource): Promise<boolean> {
         if (isGraphQLSource(source)) {
@@ -252,4 +248,15 @@ export class InputData {
 
         return schemaStore;
     }
+
+    singleStringSchemaSource(): string | undefined {
+        if (!this._schemaSources.every(([_, { schema }]) => typeof schema === "string")) {
+            return undefined;
+        }
+        const set = Set(this._schemaSources.map(([_, { schema }]) => schema as string));
+        if (set.size === 1) {
+            return defined(set.first());
+        }
+        return undefined;
+    }
 }
diff --git a/src/TypeNames.ts b/src/TypeNames.ts
index 6ec0c5ae..7a68102e 100644
--- a/src/TypeNames.ts
+++ b/src/TypeNames.ts
@@ -5,6 +5,7 @@ import * as pluralize from "pluralize";
 
 import { panic, defined } from "./Support";
 import { TypeAttributeKind, TypeAttributes } from "./TypeAttributes";
+import { splitIntoWords } from "./Strings";
 
 export type NameOrNames = string | TypeNames;
 
@@ -13,16 +14,29 @@ export type NameOrNames = string | TypeNames;
 // the names "aaa" and "aaaa" we have the common prefix "aaa" and the
 // common suffix "aaa", so we will produce the combined name "aaaaaa".
 function combineNames(names: Collection<any, string>): string {
-    const first = names.first();
-    if (first === undefined) {
+    let originalFirst = names.first();
+    if (originalFirst === undefined) {
         return panic("Named type has no names");
     }
     if (names.count() === 1) {
+        return originalFirst;
+    }
+
+    const namesSet = names
+        .map(s =>
+            splitIntoWords(s)
+                .map(w => w.word.toLowerCase())
+                .join("_")
+        )
+        .toSet();
+    const first = defined(namesSet.first());
+    if (namesSet.size === 1) {
         return first;
     }
+
     let prefixLength = first.length;
     let suffixLength = first.length;
-    names.rest().forEach(n => {
+    namesSet.rest().forEach(n => {
         prefixLength = Math.min(prefixLength, n.length);
         for (let i = 0; i < prefixLength; i++) {
             if (first[i] !== n[i]) {
diff --git a/src/index.ts b/src/index.ts
index 95770b8c..942d4d4f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -22,7 +22,7 @@ import { flattenUnions } from "./FlattenUnions";
 import { resolveIntersections } from "./ResolveIntersections";
 import { replaceObjectType } from "./ReplaceObjectType";
 import { ErrorMessage, messageError } from "./Messages";
-import { TypeSource, InputData, toString } from "./Inputs";
+import { TypeSource, InputData } from "./Inputs";
 
 // Re-export essential types and functions
 export { TargetLanguage } from "./TargetLanguage";
@@ -94,7 +94,11 @@ export class Run {
         this._options = _.mergeWith(_.clone(options), defaultOptions, (o, s) => (o === undefined ? s : o));
     }
 
-    private async makeGraph(allInputs: InputData, compressedJSON: CompressedJSON, schemaStore: JSONSchemaStore | undefined): Promise<TypeGraph> {
+    private async makeGraph(
+        allInputs: InputData,
+        compressedJSON: CompressedJSON,
+        schemaStore: JSONSchemaStore | undefined
+    ): Promise<TypeGraph> {
         const targetLanguage = getTargetLanguage(this._options.lang);
         const stringTypeMapping = targetLanguage.stringTypeMapping;
         const conflateNumbers = !targetLanguage.supportsUnionsWithBothNumberTypes;
@@ -231,14 +235,13 @@ export class Run {
 
         const compressedJSON = new CompressedJSON(makeDate, makeTime, makeDateTime);
         const allInputs = new InputData(compressedJSON, this._options.schemaStore);
-    
+
         if (await allInputs.addTypeSources(this._options.sources)) {
             needIR = true;
         }
 
-        if (!needIR && allInputs.schemaSources.size === 1) {
-            const source = defined(allInputs.schemaSources.first());
-            const schemaString = await toString(defined(source[1].schema));
+        const schemaString = needIR ? undefined : allInputs.singleStringSchemaSource();
+        if (schemaString !== undefined) {
             const lines = JSON.stringify(JSON.parse(schemaString), undefined, 4).split("\n");
             lines.push("");
             const srr = { lines, annotations: List() };
diff --git a/test/languages.ts b/test/languages.ts
index df9c17a4..fe83d776 100644
--- a/test/languages.ts
+++ b/test/languages.ts
@@ -40,7 +40,8 @@ export const CSharpLanguage: Language = {
     "7fbfb.json",
     "cda6c.json",
     "c8c7e.json",
-    "e53b5.json"
+    "e53b5.json",
+    "f82d9.json"
   ],
   allowMissingNull: false,
   output: "QuickType.cs",
@@ -359,7 +360,8 @@ export const SwiftLanguage: Language = {
     "c8c7e.json",
     "e53b5.json",
     "e8b04.json",
-    "fcca3.json"
+    "fcca3.json",
+    "f82d9.json"
   ],
   allowMissingNull: true,
   output: "quicktype.swift",