Tyler Herro is not just a #GirlDad anymore ... 'cause the Miami Heat star's famous girlfriend just gave birth to their first baby boy -- and his name is Harlem!!
The 22-year-old guard and fitness model Katya Elise Henry announced last June they were expecting their second child ... and Harlem finally arrived on Thursday.
"Welcome to this big beautiful world baby Harlem," Henry wrote alongside a photo with her son.
Herro -- who missed Thursday's game due to the birth of his son and an Achilles injury -- was right by Katya's side and even shared a photo of the dry erase board in their hospital room containing a special message .