Arson
late 17th century: an Anglo-Norman French legal term, from medieval Latin arsio(n- ), from Latin ardere ‘to burn’.
wiktionary
From Anglo-Norman and Old French arson, from the verb ardoir, from Latin ardeō(“to burn”). Compare ardent.
From Middle English arsoun, from Old French arçon, from Vulgar Latin *arciō(“saddlebow”), from Latin arcus(“bow”); compare Italian arcione, Portuguese arção, and Spanish arzón.
etymonline
arson (n.)
"malicious burning of property," 1670s, from Anglo-French arsoun (late 13c.), Old French arsion, from Late Latin arsionem (nominative arsio) "a burning," noun of action from past participle stem of Latin ardere "to burn," from PIE root *as- "to burn, glow." The Old English term was bærnet, literally "burning;" and Coke has indictment of burning (1640).
