Baby's last name

marissa

If the father and I are no longer together, would it be mean of me for me to have her have my last name and not his?

We were in a relationship but he started showing his true colors after awhile, so I left him. I've been thinking about this for awhile now and I want her to have my last name just like my son(who has a different dad). He is going to be in her life but only short visits here and there.