The man's mother and baby's grandmother-to-be was not pleased with the idea.
He explained it is the first baby for both sides of the family, which probably adds to everyone's excitement.
His mother has been pressuring him to name the baby after her brother, who died 25 years ago.
The father-to-be says he has no memories of his uncle, as he was only a year old when he died.
When the grandma-to-be found out what they plan on naming the baby, she did not hide her disappointment.
"She actually drove 30 minutes to our house so she could bang on our door and berate us in person for honouring someone who doesn't actually exist over her flesh-and-blood sibling," the man recalled.
"When we tried gently (and then firmly) to advise her that we respected her position but that we weren't going to budge on ours, she walked out and told us that she would have nothing to do with our son and would never acknowledge him as family."
Reddit users overwhelmingly agreed that the man and his wife should stick to their guns about their chosen name.
"Your child, you and your spouse's choice. That simple," one person said.
"Definitely. OP's mother is also forgetting the fact that it's the name that matters not where they got it from. Arthur is absolutely a normal name," someone else said.