The Biddle Surname begins with William Biddle. He was born in 1630 in Left, Staffordshire, England. However I can date the surname back further, but the validity is somewhat obscure.

Documents: Arney Biddle and Abigail Ogden’s Marriage License
Arney L. Biddle and Clorinda B. Reeher’s Marriage License
Silas Biddle’s Civil War Veterans’ Card (PA State Archives)