What do I say if my mother pressures me to name my baby Jim after a really awful man we knew with that name? What do I say?

I want to respect her feelings as she loved the man but he was horrible and lied about my loved ones. I do not want to pass that name on to my son after someone as horrible as this man Jim was.
Update: The man thankfully got cancer and died (karma sucks) and so my mother wants his name to be used as it has been several years since he died.
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