My family name is Griffiths, usually spelt in the correctly anglicised version of Gruffyd. I only go back to John born Llandogo, Mon. 1702, died 1749 Mitchel Troy, Mon. but buried Llandogo. His father also died Mitchel Troy 1749 and buried Llandogo. There was a Philip Griffiths born 1660 died 1747 Mitchel Troy, but buried Llantilio Crosseny. That courtesy of a Rootschatter. Evidently, he was a relative, but precise relationship unknown.
Going any further back highly unlikely.