Where does “proletara” come from?
proletara (Esperanto) comes from Esperanto proletaro, from Esperanto -aro, from Russian -а́рь, from Proto-Slavic -ařь, from Gothic -𐌰𐍂𐌴𐌹𐍃, from Proto-Germanic -ārijaz, from Latin -ārius, from Proto-Italic *-āzios.
proletara (Esperanto): proletarian
Ancestry of “proletara”, step by step