diff --git a/.changeset/sanitize-wrangler-name.md b/.changeset/sanitize-wrangler-name.md
new file mode 100644
index 000000000..22d09fd20
--- /dev/null
+++ b/.changeset/sanitize-wrangler-name.md
@@ -0,0 +1,5 @@
+---
+'sv': patch
+---
+
+fix(adapter-cloudflare): sanitize wrangler project name to comply with Cloudflare naming requirements
diff --git a/packages/sv/lib/addons/sveltekit-adapter/index.ts b/packages/sv/lib/addons/sveltekit-adapter/index.ts
index b5630edcc..ffe6f1ffb 100644
--- a/packages/sv/lib/addons/sveltekit-adapter/index.ts
+++ b/packages/sv/lib/addons/sveltekit-adapter/index.ts
@@ -2,6 +2,7 @@ import { defineAddon, defineAddonOptions } from '../../core/index.ts';
 import { exports, functions, imports, object, type AstTypes } from '../../core/tooling/js/index.ts';
 import { parseJson, parseScript, parseToml } from '../../core/tooling/parsers.ts';
 import { fileExists, readFile } from '../../cli/add/utils.ts';
+import { sanitizeName } from '../../core/sanitize.ts';
 import { resolveCommand } from 'package-manager-detector';
 import * as js from '../../core/tooling/js/index.ts';
 
@@ -139,7 +140,7 @@ export default defineAddon({
 
 				if (!data.name) {
 					const pkg = parseJson(readFile(cwd, files.package));
-					data.name = pkg.data.name;
+					data.name = sanitizeName(pkg.data.name, 'wrangler');
 				}
 
 				data.compatibility_date ??= new Date().toISOString().split('T')[0];
diff --git a/packages/sv/lib/core/sanitize.ts b/packages/sv/lib/core/sanitize.ts
new file mode 100644
index 000000000..c42461054
--- /dev/null
+++ b/packages/sv/lib/core/sanitize.ts
@@ -0,0 +1,27 @@
+/**
+ * @param name - The name to sanitize.
+ * @param style - The sanitization style.
+ *   - `package` for package.json
+ *   - `wrangler` for Cloudflare Wrangler compatibility
+ * @returns The sanitized name.
+ */
+export function sanitizeName(name: string, style: 'package' | 'wrangler'): string {
+	let sanitized = name.trim().toLowerCase().replace(/\s+/g, '-');
+	if (style === 'package') {
+		const hasLeadingAt = sanitized.startsWith('@');
+		sanitized = sanitized
+			.replace(/\s+/g, '-')
+			.replace(/^[._]/, '')
+			.replace(/[^a-z0-9~./-]+/g, '-');
+		if (hasLeadingAt) sanitized = '@' + sanitized.slice(1);
+	} else if (style === 'wrangler') {
+		sanitized = sanitized
+			.replace(/[^a-z0-9-]/g, '-')
+			.replace(/-+/g, '-')
+			.slice(0, 63)
+			.replace(/^-|-$/g, '');
+	} else {
+		throw new Error(`Invalid kind: ${style}`);
+	}
+	return sanitized || 'undefined-sv-name';
+}
diff --git a/packages/sv/lib/core/tests/sanitize.ts b/packages/sv/lib/core/tests/sanitize.ts
new file mode 100644
index 000000000..1497a22d3
--- /dev/null
+++ b/packages/sv/lib/core/tests/sanitize.ts
@@ -0,0 +1,78 @@
+import { describe, it, expect } from 'vitest';
+import { sanitizeName } from '../sanitize.ts';
+
+const testCases: Array<{ input: string; expected: string; expectedPackage?: string }> = [
+	// Basic cases
+	{ input: 'my-project', expected: 'my-project' },
+	{ input: 'myproject', expected: 'myproject' },
+
+	// Dots
+	{ input: 'sub.example.com', expected: 'sub-example-com', expectedPackage: 'sub.example.com' },
+	{ input: 'my.cool.app', expected: 'my-cool-app', expectedPackage: 'my.cool.app' },
+
+	// Underscores
+	{ input: 'my_project_name', expected: 'my-project-name' },
+
+	// Mixed cases
+	{ input: 'My_Project.Name', expected: 'my-project-name', expectedPackage: 'my-project.name' },
+	{ input: 'MyAwesomeApp', expected: 'myawesomeapp' },
+
+	// Special characters
+	{ input: '@scope/package', expected: 'scope-package', expectedPackage: '@scope/package' },
+	{ input: 'hello@world!test', expected: 'hello-world-test' },
+
+	// Multiple consecutive invalid chars
+	{ input: 'my..project__name', expected: 'my-project-name', expectedPackage: 'my..project-name' },
+
+	// Leading/trailing invalid chars
+	{ input: '.my-project.', expected: 'my-project', expectedPackage: 'my-project.' },
+	{ input: '---test---', expected: 'test', expectedPackage: '---test---' },
+
+	// Numbers
+	{ input: 'project123', expected: 'project123' },
+	{ input: '123project', expected: '123project' },
+
+	// Empty/invalid fallback
+	{ input: '___', expected: 'undefined-sv-name', expectedPackage: '-' },
+	{ input: '!@#$%', expected: 'undefined-sv-name', expectedPackage: '-' },
+	{ input: '', expected: 'undefined-sv-name' },
+
+	// Length limit (63 chars max)
+	{ input: 'a'.repeat(70), expected: 'a'.repeat(63), expectedPackage: 'a'.repeat(70) },
+	{
+		input: 'my-very-long-project-name-that-exceeds-the-limit-of-63-characters-allowed',
+		expected: 'my-very-long-project-name-that-exceeds-the-limit-of-63-characte',
+		expectedPackage: 'my-very-long-project-name-that-exceeds-the-limit-of-63-characters-allowed'
+	},
+
+	// Truncation trap: slice leaves trailing dash
+	{
+		input: 'a'.repeat(62) + '-b',
+		expected: 'a'.repeat(62),
+		expectedPackage: 'a'.repeat(62) + '-b'
+	},
+
+	// Spaces
+	{ input: 'my cool project', expected: 'my-cool-project' },
+	{ input: '  spaced  out  ', expected: 'spaced-out' },
+
+	// Exact boundary (off-by-one check)
+	{ input: 'a'.repeat(63), expected: 'a'.repeat(63) },
+
+	// Unicode / accents / emojis (replaced with dashes)
+	{ input: 'piñata', expected: 'pi-ata' },
+	{ input: 'café', expected: 'caf', expectedPackage: 'caf-' },
+	{ input: 'cool 🚀 app', expected: 'cool-app', expectedPackage: 'cool---app' }
+];
+
+describe('sanitizeName wrangler', () => {
+	it.each(testCases)('sanitizes $input to $expected', ({ input, expected }) => {
+		expect(sanitizeName(input, 'wrangler')).toBe(expected);
+	});
+});
+
+describe('sanitizeName package', () => {
+	it.each(testCases)('sanitizes $input to $expected', ({ input, expected, expectedPackage }) => {
+		expect(sanitizeName(input, 'package')).toBe(expectedPackage ?? expected);
+	});
+});
diff --git a/packages/sv/lib/create/index.ts b/packages/sv/lib/create/index.ts
index 59b1ba8fb..849222414 100644
--- a/packages/sv/lib/create/index.ts
+++ b/packages/sv/lib/create/index.ts
@@ -1,6 +1,7 @@
 import fs from 'node:fs';
 import path from 'node:path';
 import { mkdirp, copy, dist, getSharedFiles } from './utils.ts';
+import { sanitizeName } from '../core/sanitize.ts';
 
 export type TemplateType = (typeof templateTypes)[number];
 export type LanguageType = (typeof languageTypes)[number];
@@ -89,7 +90,7 @@ function write_common_files(cwd: string, options: Options, name: string) {
 
 	pkg.dependencies = sort_keys(pkg.dependencies);
 	pkg.devDependencies = sort_keys(pkg.devDependencies);
-	pkg.name = to_valid_package_name(name);
+	pkg.name = sanitizeName(name, 'package');
 
 	fs.writeFileSync(pkg_file, JSON.stringify(pkg, null, '\t') + '\n');
 }
@@ -158,12 +159,3 @@ function sort_files(files: Common['files']) {
 		return same || different ? 0 : f1_more_generic ? -1 : 1;
 	});
 }
-
-function to_valid_package_name(name: string) {
-	return name
-		.trim()
-		.toLowerCase()
-		.replace(/\s+/g, '-')
-		.replace(/^[._]/, '')
-		.replace(/[^a-z0-9~.-]+/g, '-');
-}