It’s rough bluegrass. If your lawn is too wet (this year it is) then it can spread. It doesnt like dry conditions, at least compared to normal kentucky bluegrass. I gave up removing it since it seems to choke off my other weeds and I’d rather spend time fishing than taking care of my lawn anymore. I tried pulling/shoveling it out but that didn’t remove it completely. Glyphosate might be better to eliminate it.
https://apps.extension.umn.edu/garden/diagnose/weed/grass/roughbluegrass.html