In Portuguese, the correct feminine form of “nymph” is . The word ninfo (masculine) is rare or nonstandard. “Ninfo” might be a truncation of ninfa or an invented gendered term. This suggests the speaker/creator used ninfo to indicate a non-human, androgynous or hybrid nature being .
Thus, “Sereia Ninfo” would describe a – a freshwater or transitional-water spirit with characteristics of both a Greek nymph and an Iberian/Atlantic mermaid. sereia ninfo