Where does “ró” come from?

ró (Old Irish) comes from Proto-Celtic ɸro, from Proto-Indo-European pró, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Ancestry of “ró”, step by step

StepLanguageWordMeaning
1Proto-Celticɸro—
2Proto-Indo-Europeanprótoward, leading to
3Proto-Indo-Europeanper-before, in front; first; to go through
4Proto-Indo-Europeanpr̥tóspassed , crossed

Words derived from “ró”

Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Indo-European pró →
ró — Etymology, Origin & Word History | Etymology Explorer