SpaceX boss, Elon Musk and his girlfriend welcome their baby boy.

SpaceX boss and Co-founder of Tesla, Elon Musk and his girlfriend, Grimes welcomed their baby boy on Monday night after he announced on Friday that he and his girlfriend would welcome their baby boy on Monday.

Grimes' baby boy is Elon's sixth child and last boy while it's Grimes' first child. Elon Musk has given his baby boy a name which no one understands. He named his baby boy, X Æ A-12 Musk.

Elon's son name has caused alot of reactions on Twitter, because no one actually knows why he chose such name and no one understands the significance of the name.