Her mother went on to explain why she was so vehemently against the baby name. She confessed it brought up old wounds as it was the name of the woman her husband had had an affair with.
"The year I was born my dad had an affair with a woman named Catalina. It was an affair that lasted around three months and almost broke up my parents' marriage. I wasn't aware of the fact till very recently," she wrote.
The mum-to-be feels stuck between a rock and a hard place as her partner isn't particularly sympathetic and says her mum just needs to "get over it".
However, one aunt agrees the grandma's feelings should be taken into consideration.
The woman says she loves the name but doesn't want to inflict "emotional damage" on her mum.
Most people on Reddit suggested the woman find another name for her baby.
"I know it's your kid and you can choose any name you wish but do you really want your mum to be reminded of something emotionally painful every time she sees or hears her name?" someone asked.
"There are very few situations where I'd say someone should change the name they plan for their baby. This is definitely one of them," someone else said.
"That's incredibly selfish of both you and your BF (boyfriend). Your mother will want to cry literally every team she sees your granddaughter. Why do that to BOTH of them?"
In the end, the woman says she sat down with her mum and agreed on the shorter version "Cat" and agreed to use it as a middle name.
"All in all she doesn't want my father's ex affair to have a grip on her life any longer and did indeed decide to take up therapy after her breakdown," the woman said.