Serena Williams has officially informed the world of her daughter's birth and her name. Announced on her Instagram and website, Williams and her fiancé Alexis Ohanian have shared that their first baby's name is Alexis Olympia Ohanian, Jr. 

Welcome, Olympia, we're so happy to meet you. We made you a video of our adventure together so far (see bio).

A post shared by Alexis Ohanian ???? (@alexisohanian) on

"So we're leaving the hospital after six days," Williams said in a video chronicling her entire pregnancy journey. "It's been a long time. But, we had a lot of complications. But, look what we've got. We've got a baby girl. Junior."

Alexis Olympia Ohanian, Jr. was born on September 1, during Week 1 of the US Open, and weighed 6 pounds, 14 ounces.