That's not necessarily true. Maybe the kid has three or four names, and Stefano is just one of them. It might be painful for Caroline to hear the child called "Stefano". Or maybe Andrea and Tatiana just prefer to call him Sacha for some reason.
My sister is honored with the names of our mother and both grandmothers and we don't call her any of them. We use a nickname.
"Be who God intended you to be, and you will set the world on fire" St. Catherine of Siena
"The arc of the moral universe is long, but it bends toward justice". Martin Luther King Jr. 1929-1968