Luca understood that this child wasn't his, but rather, the offspring of Ansel and Laura's union. He had no rights or power over what the child should be named because he wasn't even related to them in any way, not even close enough to offer a naming suggestion.
But even so, the fact that Laura had turned around to name the child something completely different than what Ansel had planned hurt him like hell. He was sure Laura knew Lukas was the planned name, since Ansel had already drafted Luzia, the female variant, in case the child had been revealed as a girl.
Luca left the hospital that day with much lower spirits compared to the anticipation he came with, looking forward to seeing the child.