I have a more reputable source for the mean and origin of the surname, “Griffith.” I heard from another Griffith years ago that the name was Welsh and stood for “red headed tribal chieftain.” Thatç—´ a lot of description for one little word.
So, according to The Family Chronicle, here is the definition:
Griffith is British-Welsh and comes from the middle Welsh “Gruffund;” “und” means lord. The name is taken from or based upon the first name of the ancestor’s father, which makes it patronymic.
And, according to The Sweetest Sound from PBS, it is number 358 out of a possible 55,000 of the most popular surnames in the USA. Go figure.