Another "interesting" celeb baby name...

What celebrity just named their newborn son Exton Elias?

It's Robert Downey Jr. and his wife Susan.  Son Exton Elias Downey was born at 7:24 a.m. on Tuesday, Feb. 7 in Los Angeles, his rep confirms to PEOPLE.

“Everyone is healthy and they couldn’t be happier,” a friend of the couple says.

Baby boy weighs in at 7 lbs., 5 oz., is 20 inches long and joins big brother Indio, 18, Downey’s son from his previous marriage.

After announcing the pregnancy in August, Downey revealed the sex of the baby on national television, much to his producer wife’s (feigned) chagrin.

“I could never really stay mad at him, but I can tell you it genuinely wasn’t something we planned to reveal,” Susan explained.

Thankfully, her husband did manage to keep quiet about their name choice.

“If I told you the name, then she would lop off my head with a machete,” joked Downey.