Tetra

Tetra is a Greek numeral prefix meaning "four", so it could make a fitting choice for a fourth child or for an IV.

There is a female character by the name in the Legend of Zelda video game franchise; she’s a young pirate captain who is an alter-ego of the eponymous heroine, Princess Zelda.

A tetra is also a type of small freshwater fish, so at a stretch it's also both an animal names and one of the names associated with water.

Pronounced TET-ruh.

As of October 2026, Tetra ranked #15036 in US births in 2024 SSA, peaked at #9518 in 1971.