Has anyone ever decided to change their last names after kids, but held off after marriage?

I didn't change my name after I got married just over a year ago. My LO is three months now and I'm thinking it might be nice to be called the X family instead of X-Y family (it doesn't sound very good tbh), plus I thought it'd be nice to sound like one cohesive unit, especially if we're planning for another kid in the future. Now that LO has her birth cert, SSN, passport, it might be a bit of a pain too, on top of updating all of my documentation.

DH always left it up to me, but I think he'd want me to change it if he had a choice.

Anyone done something similar?