Latin word supra comes from Old Latin suprād, superā

Detailed word origin of supra

Dictionary entry	Language	Definition
suprād, superā	Old Latin (itc-ola)
supra	Latin (lat)	(of employment or office) over, in authority over, in charge of. (of location) over, above, beyond. (of number, degree, or quantity) over, above, beyond, more than. (of time) before (of number or measure) more, beyond, over. (of place) above, on the top, on the upper side. (of time) before, previously, formerly.