'Doge' is a word borrowed from French 'doge'. The word entered the English language some time around 1549.
doge [noun] [1549]
See 'doge' on the Loan Words Map
See more loan words from French.
note: French from Venetian Italian doze from Latin dux or duc.
Etymology: Italian dialect, from Latin 'duc-, dux' leader
See more loan words from 1500s.