padrinho m (plural padrinhos, feminine madrinha, feminine plural madrinhas)
From Old Portuguese padrinno, from Vulgar Latin *patrīnus, from Latin pater (“father”), from Proto-Indo-European *ph₂tḗr (“father”).
Compare Galician padriño, Spanish padrino, Catalan padrí, Occitan pairin, French parrain and Italian padrino.