Delta is an unusual vintage option, blending the sounds of Della and Etta. The fourth letter of the Greek alphabet and a geographical term, used to describe an island formed at the mouth of a river, some may be put off by Delta's links the airline company of COVID variant on the same name.

Aleph came into the spotlight when chosen by Israel-born Natalie Portman for her son. Alef is a more common spelling of these related Hebrew baby names.

The sixth letter of the Greek alphabet, popularized by Welsh actress Catherine Zeta-Jones -- Zeta was her grandmother's first name. Zeta can also refer to the letter Z, the last in the Roman alphabet, or be a spelling variation of Zita, a name with several possible origins and meanings.

Theta is the name of the eighth letter of the ancient Greek alphabet, which is also the symbol of death. As such, it has rarely been used as a baby name.