Am I being unreasonable ?

So I’m pregnant with my first child. Since it’s a boy my husband and I agreed that his middle name would be the same as his great grandpas because my husband was raised by him. So we have had this name chosen and have told everyone the meaning behind this name. Our problem is today my older sister comes up to my tummy and says hello my name sake baby. Like no just because your middle name is spelled like his does not mean we are naming him after you. And my husband got very offended because he feels like she’s trying to take away the special meaning of his name away from his Pawpaw. And we tried to correct her and we were told he can be named after more than one person. Like no I don’t want him to think he’s named after my older sister. So now he’s not even wanting to give him the middle name we agreed to because he doesn’t want my older sister thinking she’s special. Are we being unreasonable??