Where does “ab” come from?

ab (Old Catalan) comes from Latin apud, from Latin ad post.

Ancestry of “ab”, step by step

StepLanguageWordMeaning
1Latinapudat, by, near, among; before, in the presence of,...
2Latinad post—

Words derived from “ab”

Every word from Latin ad post →Every word from Latin apud →
ab — Etymology, Origin & Word History | Etymology Explorer