crest gerwitz.com

Here

The Brothers Gerwitz: The family history of course includes many Gerwitzes, back to the umlauts.

Elsewhere

Other Gerwitzes around the web:

Dyslexia

Professors Alan, Jacob, and Jonathan and screenwriter Russel are often cited as Gerwitzes, but actually carry the surname of Gewirtz. But Brian Gewirtz is the most egregious of these impostors thanks to barely-literate observers of the WWE.

You'll have to ask David about them.