The star shared his name (viaCosmopolitan)!
“ZIGGY BLU ROSS.
Our sweet boy has arrived!

I’m over the MOON we are Blessed!”
Simpson posted along with an adorable photo late last week.
Ziggy joins 5-year-old Jagger and Simpson’s son from her marriage to Pete Wentz, 11-year-old Bronx.

It’s no surprise that the couple chose the name Ziggy for the little boy.
After all, they both come from musical families.
Jagger is the last name of The Rolling Stones frontman Mick.
Remember Maroon 5’s “Moves Like Jagger?”
Sorry if we got that in your head now!
The musical theme aside, Ziggy also has a very powerful backstory.
According toBabyNames.com, the moniker is of German origin and means “victorious protector.”
No matter the name inspiration, little Ziggy Ross is as cute as can be!
Here’s wishing Simpson and her family every happiness as they enjoy their new bundle of joy.