ᠨᠠᠮᡠ ᡠᠯᡤᡳᠶᠠᠨ

Manchu

ᠨᠠᠮᡠ (namu, “ocean”) +‎ ᡠᠯᡤᡳᠶᠠᠨ (ulgiyan, “pig”).

This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.
Particularly: “calque of 海豚 (hǎitún)?”