Balcony
early 17th century: from Italian balcone, probably ultimately of Germanic origin.
wiktionary
From Italian balcone(“balcony, floor-length window”), from Old Italian balcone(“scaffold”) from Lombardic *balk, *balko(“beam”), from Proto-Germanic *balkô(“beam”), from Proto-Indo-European *bʰelǵ-(“beam, pile, prop”). Akin to Old High German balco, balcho(“beam”), Old English balca(“beam, ridge”). More at balk.
etymonline
balcony (n.)
1610s, "platform projecting from a wall of a building surrounded by a wall or railing," from Italian balcone, from balco "scaffold," which is from a Germanic source (perhaps Langobardic *balko- "beam"), from Proto-Germanic *balkon- (see balk (n.)). With Italian augmentative suffix -one. From 1718 as "gallery in a theater." Until c. 1825, regularly accented on the second syllable. Related: Balconied.
