Where does “Probert” come from?

Probert (English) comes from Welsh ap, from Welsh fab, from Welsh mab, from Old Welsh map, from Proto-Brythonic mab, from Proto-Celtic makʷos, from Proto-Indo-European mh₂ḱwos, from Proto-Indo-European meh₂ḱ- — to raise, increase; long.

Ancestry of “Probert”, step by step

Probert traces back through two separate lines of ancestry.

via Welsh ap

StepLanguageWordMeaning
1WelshapA patronymic indicator; son of
2WelshfabSoft mutation of mab
3Welshmabboy, son, infant, child of either sex, minor, youth
4Old Welshmapson
5Proto-Brythonicmabson
6Proto-Celticmakʷosson
7Proto-Indo-Europeanmh₂ḱwos—
8Proto-Indo-Europeanmeh₂ḱ-to raise, increase; long

via Welsh Roppert

StepLanguageWordMeaning
1WelshRoppertson of Robert
Every word from Proto-Indo-European meh₂ḱ- →Every word from Proto-Indo-European mh₂ḱwos →Every word from Proto-Celtic makʷos →