Pray
Middle English (in the sense ‘ask earnestly’): from Old French preier, from late Latin precare, alteration of Latin precari ‘entreat’.
wiktionary
From Middle English preien, from Anglo-Norman preier, from Old French preier, proier, (French prier), from Late Latin *precāre, from Latin precārī, present active infinitive of precor, from prex, precis(“a prayer, a request”), from Proto-Indo-European *preḱ-(“to ask, woo”). Cognate via Indo-European of Old English frignan, fricgan, German fragen, Dutch vragen. Confer deprecate, imprecate, precarious.
Ellipsis of I pray you, I pray thee, whence also prithee.
etymonline
pray (v.)
early 13c., preien, "ask earnestly, beg (someone)," also (c. 1300) in a religious sense, "pray to a god or saint," from Old French preier "to pray" (c. 900, Modern French prier), from Vulgar Latin *precare (also source of Italian pregare), from Latin precari "ask earnestly, beg, entreat," from *prex (plural preces, genitive precis) "prayer, request, entreaty," from PIE root *prek- "to ask, request, entreat."
From early 14c. as "to invite." The deferential parenthetical expression I pray you, "please, if you will," attested from late 14c. (from c. 1300 as I pray thee), was contracted to pray in 16c. Related: Prayed; praying.
Praying mantis attested from 1809 (praying locust is from 1752; praying insect by 1816; see mantis). The Gardener's Monthly of July 1861 lists other names for it as camel cricket, soothsayer, and rear horse.
