Help with baby names?

I'll be 21 in April and I live with my parents while I work and go to college to get my business degree and found out a few weeks ago I'm pregnant and am already showing a tiny bit and right now I'm figuring out what to name my baby. For a girl (if that's what they say I'm having at my first prenatal appointment) I have liked the name either Madilynn Kate or Madilynn Mackenzie. My dad doesn't like them. He thinks those names remind him of an old lady. I like them alot and I have tried to pick other names just to please my dad since his opinion means a lot to me but I always cone back to those two names. What do I do? What do you think about those names?