Where does “templar” come from?

Templar comes from Old French templier, a member of a military religious order.

templar (English): One of the Knights Templar

Definitions

Step	Language	Word	Meaning
1	German	Templer	a Templar
2	Old French	templier	—
3	Latin	templum	an open space for augural observation; open,...
4	Proto-Indo-European	t(e)mp-lo-s	—
5	Proto-Indo-European	temp-	to extend, stretch, span; to stetch, string; to...