diff --git a/lib/sitemap-simple.ts b/lib/sitemap-simple.ts
index 4d065a5..d345c1e 100644
--- a/lib/sitemap-simple.ts
+++ b/lib/sitemap-simple.ts
@@ -13,6 +13,11 @@ import { URL } from 'url';
 import { WriteStream } from 'fs';
 
 const pipeline = promisify(pline);
+
+function defaultNameGenerator(index: number) {
+  return `./sitemap-${index}.xml`;
+}
+
 /**
  *
  * @param {object} options -
@@ -36,6 +41,7 @@ export const simpleSitemapAndIndex = async ({
   limit = 50000,
   gzip = true,
   publicBasePath = './',
+  nameGenerator = defaultNameGenerator,
 }: {
   hostname: string;
   sitemapHostname?: string;
@@ -44,6 +50,7 @@ export const simpleSitemapAndIndex = async ({
   publicBasePath?: string;
   limit?: number;
   gzip?: boolean;
+  nameGenerator?: (index: number) => string;
 }): Promise<void> => {
   await promises.mkdir(destinationDir, { recursive: true });
   const sitemapAndIndexStream = new SitemapAndIndexStream({
@@ -52,7 +59,7 @@ export const simpleSitemapAndIndex = async ({
       const sitemapStream = new SitemapStream({
         hostname,
       });
-      const path = `./sitemap-${i}.xml`;
+      const path = nameGenerator(i);
       const writePath = resolve(destinationDir, path + (gzip ? '.gz' : ''));
       if (!publicBasePath.endsWith('/')) {
         publicBasePath += '/';
diff --git a/tests/sitemap-simple.test.ts b/tests/sitemap-simple.test.ts
index 526aa1f..83b41a5 100644
--- a/tests/sitemap-simple.test.ts
+++ b/tests/sitemap-simple.test.ts
@@ -37,6 +37,16 @@ describe('simpleSitemapAndIndex', () => {
     ]);
   });
 
+  afterEach(() => {
+    removeFilesArray([
+      resolve(targetFolder, `./sitemap-index.xml.gz`),
+      resolve(targetFolder, `./0.xml`),
+      resolve(targetFolder, `./1.xml`),
+      resolve(targetFolder, `./2.xml`),
+      resolve(targetFolder, `./3.xml`),
+    ]);
+  });
+
   it('writes both a sitemap and index', async () => {
     const baseURL = 'https://example.com/sub/';
 
@@ -303,4 +313,42 @@ describe('simpleSitemapAndIndex', () => {
     );
     expect(xml.toString()).toContain('1.example.com');
   });
+
+  it('able to generate sitemap names with provided generator', async () => {
+    const baseURL = 'https://example.com/sub/';
+
+    await simpleSitemapAndIndex({
+      hostname: baseURL,
+      sourceData: [
+        'https://1.example.com/a',
+        'https://2.example.com/a',
+        'https://3.example.com/a',
+        'https://4.example.com/a',
+      ],
+      destinationDir: targetFolder,
+      limit: 1,
+      nameGenerator: (index) => `${index}.xml`,
+      gzip: false,
+    });
+
+    const index = (
+      await streamToPromise(
+        createReadStream(resolve(targetFolder, `./sitemap-index.xml`))
+      )
+    ).toString();
+    expect(index).toContain(`${baseURL}0`);
+    expect(index).toContain(`${baseURL}1`);
+    expect(index).toContain(`${baseURL}2`);
+    expect(index).toContain(`${baseURL}3`);
+    expect(index).not.toContain(`${baseURL}4`);
+    expect(existsSync(resolve(targetFolder, './0.xml'))).toBe(true);
+    expect(existsSync(resolve(targetFolder, './1.xml'))).toBe(true);
+    expect(existsSync(resolve(targetFolder, './2.xml'))).toBe(true);
+    expect(existsSync(resolve(targetFolder, './3.xml'))).toBe(true);
+    expect(existsSync(resolve(targetFolder, './4.xml'))).toBe(false);
+    const xml = await streamToPromise(
+      createReadStream(resolve(targetFolder, './0.xml'))
+    );
+    expect(xml.toString()).toContain('https://1.example.com/a');
+  });
 });