Where does “Comforter” come from?

Comforter derives from Ancient Greek παράκλητος, from καλέω meaning "to call," ultimately from Proto-Indo-European per- and pr̥tós.

Ancestry of “Comforter”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	παράκλητος	Called to aid, helping; legal assistant,...
2	Ancient Greek	πᾰρᾰ-	near; next to; by, near
3	Ancient Greek	παρά
4	Latin	verēdus	—
5	Gaulish	werēdos	horse
6	Proto-Celtic	*uɸoreidos	—

Comforter — Etymology, Origin & Word History | Etymology Explorer