11:30 AM PT -- TMZ Sports has learned ... Aja's two other children were fathered by "Happy Endings" star Damon Wayans Jr. ... the son of "In Living Color" legend Damon Wayans (obviously).
We're told Damon is very involved in the children's lives.
TMZ Sports has obtained the birth certificate for Dwyane Wade's brand new son ... which shows the kid's name is Xavier Zechariah Wade ... and he was only born last month.
Of course, Wade recently acknowledged that he had a kid with a woman who isn't his fiancee Gabrielle Union. There are reports that Wade and Union were on a break when the child was conceived.
Now, we know the kid was born in Los Angeles on Nov. 10, 2013 ... just 6 weeks before Wade popped the question to Gabrielle, who he's been dating since 2009.
According to the birth certificate, Wade's baby mama is 30-year-old Aja Metoyer. The details of their relationship are basically unknown, except the obvious fact they have a kid together.
Aja has two other children.
Metoyer did not list Wade as the father on the birth certificate, but she did give the child Dwyane's last name.
Sources connected to the situation tell us ... Dwyane has been making a serious effort to be a part of the child's life and has visited Xavier several times since his birth. Most recently, Dwayne visited his son while he was in L.A. to play the Lakers on Christmas Day.