Where does “manta” come from?

manta (Galician) comes from Galician manto, from Old Portuguese manto, from Late Latin mantum, from Latin mantellum, from Latin mantum, from Gaulish mantos, from Proto-Celtic mantos, from Proto-Indo-European menH- — tread, press together; crumble.

manta (Galician): blanket; runner stone; fry shoal