In the season 7 finale of Game of Thrones, we find out that Rhaegar's youngest son's given name at birth is:
Aegon Targaryen. In the books, we know that was the name given to the male child of Elia and Rhaegar. In the books, he was actually swapped with another baby and snuck away to be raised out of Westeros, and was not killed by the Lannisters when they stormed King's Landing, unknown to almost everyone. That was dropped from the TV show, but I always assumed that the baby who was killed was named Aegon. It seems odd that they'd name two sons of Rhaegar the same name.
Were the names of the other children ever explicitly stated in the show (not the books)?