Where does “Penry” come from?

Penry is an English surname derived from Welsh ap or fab, meaning "son of," used as a patronymic prefix in Welsh names.

Ancestry of “Penry”, step by step

Step	Language	Word	Meaning
1	Welsh	ap	A patronymic indicator; son of
2	Welsh	fab	Soft mutation of mab
3	Welsh	mab	boy, son, infant, child , minor, youth;...
4	Old Welsh	map	—
5	Proto-Brythonic	mab	son
6	Proto-Celtic	makʷos	son
7	Proto-Indo-European	mh₂ḱwos	—
8	Proto-Indo-European	meh₂ḱ-	to raise, increase; long