Sire
Middle English (in sire (sense 2 of the noun)): from Old French, from an alteration of Latin senior (see senior). sire (sense 1 of the noun) dates from the early 16th century.
wiktionary
From Middle English sire, from Old French sire, the nominative singular of seignor; from Latin senior, from senex. Doublet of senior, seigneur, seignior, sir, and monsieur.
etymonline
sire (n.)
c. 1200, title placed before a name and denoting knighthood, from Old French sire "lord (appellation), sire, my lord," from Vulgar Latin *seior, from Latin senior "older, elder," from PIE root *sen- "old." Standing alone and meaning "your majesty" it is attested from early 13c. General sense of "important elderly man" is from mid-14c.; that of "father, male parent" is from mid-13c.
sire (v.)
"to beget, to be the sire of," 1610s, from sire (n.). Used chiefly of beasts, especially of stallions. Related: Sired; siring.
