AITA for refusing to “demote” my dog after my sister gave her baby the same name?

I (26F) have a dog named Charlie. Charlie is a golden retriever I adopted four years ago, and he’s my best buddy. My sister, Emily (29F), recently had her first child—a baby boy. She and her husband named him… Charlie.
At first, I thought it was funny and didn’t really think much of it. But then Emily pulled me aside during a family gathering and said it was “confusing and disrespectful” for me to keep calling my dog Charlie now that her son has the same name. She asked me to rename my dog.

I told her no. Charlie has been his name for four years; he knows it, responds to it, and it’s on all his paperwork. Changing it would be weird for him (and for me). She got really upset and said it’s not fair for her son to “share” a name with a dog, especially in family settings. She thinks it’ll lead to jokes and confusion as her son grows up.

My parents have weighed in, and while my dad says it’s ridiculous to expect me to change my dog’s name, my mom says I should “just consider it” to keep the peace. Now Emily’s barely speaking to me, and a few family members think I’m being stubborn. I have no idea how I am in the wrong here. The worlds gone crazy.

I love my dog, and I didn’t name him to spite anyone. I also think it’s not my fault they chose a name already in use in the family. AITA?