My Son's Name

I'm 32 weeks pregnant with my 2nd child, when I got pregnant with my daughter I told my brothers if I had a boy his name would be alexander and if I had a daughter her name would be anndeliez which is what I named my daughter. Me and my SIL ended up pregnant together this was their first baby and couldn't decide on a name the day my nephew was born I found out they named him alexander Logan he's now 5 months they came over not to long ago and she was extremely upset to hear I would still be naming my son alexander after his father, but it would be Messiah Alexander she asked for us not to call our son by Alexander. It aggravated me and I spoke to my brother about it but they feel like it's me being overly emotional. I haven't spoken to my SIL since, am I wrong? Should I pick another name or should I name my son after his father?