You got me curious:

From Middle English ambassadore, from Anglo-Norman ambassadeur. From Old Italian ambassatore, ambassadore, from Old Occitan ambaisador (“ambassador”), from Latin ambasiātor, from Latin ambasiātor. From Gothic 𐌰𐌽𐌳𐌱𐌰𐌷𐍄𐌹 From Proto-Germanic ambahtiją (“service”) Borrowed from Gaulish ambaxtos (“servant”) From Proto-Celtic ambaxtos (“servant”) From ambi- (“around”) +‎ ageti (“to drive”) +‎ *-os.