Names That Mean Pious

Soft, light, and international, Pia is familiar across Europe, South America, and Asia. Usually considered a feminine form of the Latin Pius — lending it a surprisingly serious and spiritual air — it may also be used as a short form of elegant Olympia or as a derivative of the Sanskrit priya meaning "beloved".
 
Similar in sound to other popular choices, notably Mia, Nia, and Pippa, it currently features in the Top 1000 in England and Wales, the Top 200 in France, and the Top 100 in Uruguay, Chile, Slovenia, and Norway. The name may also appear as Pía in Spanish and as Piia in Finnish and Estonian.
 
Actress Ingrid Bergman had a daughter called Pia while reality TV star Ella May Ding named her daughter Pia in 2025. Notable Pias include: the singers Pia Mia and Pia Toscano, the models Pia Miller and Pia Alonzo Wurtzbach; the actresses Pia Miranda, Pia Tjelta, and Pia Bajpai, and the poet Pia Juul, among many, many others.

If you can put aside the oil connection, Castor is a mythological option, borne by one of the (half) twins that make up the constellation Gemini, the other being Pollux. A son of Leda and a king of Sparta, and a sibling of Helen of Troy, Castor and Pollux are seen as patrons of travellers and sailors, and of athletes. 
 
The exact meaning of the name is unknown, though speculation suggests it means "shining" (from kekasmai), "wood" (from Doric Greek káston), or, in a more contemporary context, "beaver" from the Greek word for the animal. The latter is unlikely to be the original source, however, given beavers would not have been native to Greece. There's also the Greek katharos meaning "clean, pure" which might be another possible source. 
 
Used by Metallica's James Hetfield for his son in 2000, it may inevitably linked to the aforementioned castor oil, a substance of many purposes, used in soaps, lubricants, brake fluids, dyes, and waxes. Nevertheless, it first appeared in the US stats back in the late 1990s and was given to 21 boys in a recent year.

Castor

Though the variation Pius is too, well, popeish, Pio might work for an ordinary boy. 

Fruma is too frumpy for a baby born today.
 
In Fiddler on the Roof, Fruma is the name of a ghost.

Names That Mean Pious

The names

Pia

Castor

Pio

Fruma