Where does “ilarujo” come from?
ilarujo (Esperanto) comes from Esperanto ilaro, from Esperanto -aro, from Russian -а́рь, from Proto-Slavic -ařь, from Gothic -𐌰𐍂𐌴𐌹𐍃, from Proto-Germanic -ārijaz, from Latin -ārius, from Proto-Italic *-āzios.
ilarujo (Esperanto): a toolbox for a toolset
Ancestry of “ilarujo”, step by step