Blouin

a surname, Blouin; Blouin (a lake in Abitibi-Témiscamingue, Quebec, Canada; in full, Lac Blouin)

Shortened from the name Belouin, of Germanic origin, from *bil(i) (“gentle, kind, fitting”) + *winiz (“loved one, friend”). Also from the Old French adjective bloe (“blue”). Compare the variant Beloin.