Where does “futanaro” come from?

futanaro (Italian) comes from Italian -aro, from Latin -ārius, from Proto-Italic *-āzios — Forms relational adjectives to nouns (and rarely numerals).

Ancestry of “futanaro”, step by step

Step	Language	Word	Meaning
1	Italian	-aro	Alternative form of -aio
2	Latin	-ārius	er
3	Proto-Italic	*-āzios	Forms relational adjectives to nouns (and rarely numerals)

Every word from Proto-Italic *-āzios →Every word from Latin -ārius →Every word from Italian -aro →