Per

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Latin, ‘through, by means of’; partly via Old French.

wiktionary

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From Latin per(“through, during”), from Proto-Indo-European *per. Doublet of par.

shortening of person, coined by Marge Piercy in Woman on the Edge of Time (1979)

etymonline

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per (prep.)

"through, by means of," 1580s (earlier in various Latin and French phrases, in the latter often par), from Latin per "through, during, by means of, on account of, as in," from PIE root *per- (1) "forward," hence "through, in front of, before, first, chief, toward, near, around, against."