It was a sweet end to Mother's Day for Elon Musk and Grimes. 

The couple recently welcomed their first child together, quickly making headlines around the world for their baby boy's very unique name, X Æ A-12 Musk. While the pronunciation of the little one's standout moniker has not yet been officially determined, the Tesla co-founder did "like" a tweet theorizing his name is said as "X Ash Archangel."