Yes, Griffith is a Welsh name, not Irish.
It is an Irish surname. In Griffith's Valuations (1848-64) it was represented in Down, Roscommon, Armagh and Meath.
Griffith Edwards's birth name is James Griffith Edwards.
Alisyn Griffith's birth name is Alisyn Rose Griffith.
Emile Griffith's birth name is Emile Alphonse Griffith.
Gattlin Griffith's birth name is Gattlin Tadd Griffith.
Harry Griffith's birth name is Harry Sutherland Griffith.
Kelli Griffith's birth name is Kelli Lyn Griffith.
Laetitia Griffith's birth name is Laetitia Julitte Griffith.
Melanie Griffith's birth name is Melanie Richards Griffith.
Murphy Griffith's birth name is Murphy Emanuel Griffith.
Nanci Griffith's birth name is Nanci Caroline Griffith.
Rhiana Griffith's birth name is Rhiana Jade Griffith.