Where does “Vaughn” come from?

Vaughn derives from Welsh bychan, which comes from Welsh bach, from Proto-Celtic bikkos, ultimately from Proto-Indo-European -kos, a diminutive suffix meaning small.

Ancestry of “Vaughn”, step by step

Step	Language	Word	Meaning
1	English	Vaughan	—
2	Welsh	Vychan	—
3	Welsh	bychan	small; little
4	Middle Welsh	bych	—
5	Proto-Brythonic	bɨx	small
6	Proto-Celtic	*biggos	—

Every word from Proto-Celtic *biggos →