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Entrepreneur Elon Musk and musical artist Grimes welcomed a baby boy, “X Æ A-12,” to the world. Here’s a possible explanation of the name.

USA TODAY

After naming her first-born child X Æ A-XII, Grimes is now going by an unusual moniker herself.

According to a New York Times interview with the artist, published Wednesday, Grimes, whose real name is Claire Boucher, now goes by “c” — which she says is a reference to the speed of light.

A single-letter nickname is something Grimes now has in common with her 5-month-old, who goes by “X” for short. C, 32, shares X with her boyfriend, SpaceX CEO Elon Musk, 49.

Though X is still an infant, his mother claims he’s already developed sophisticated taste in media.

“I’ve watched ‘Apocalypse Now’ and stuff with…