I follow nautique and their boats are super easy. Super air 210, super air 230. 21' and 23'. G21, g23, g25. Everyone knows g series and length follows. GS series is the same.
Malibu has vlx 21 and 22. Mxz 21 and 22. Lsv 23 and 25. Different hulls but the length is straight forward.
Axis has t and x series with length listed.
Moomba has some nice boats, but I think their naming system is less helpful compared to other companies. Not saying it's bad at all. It's actually neat that moomba tries to go a different direction. Also anyone in their right mind should do a little investigating into all of these brands before spending the kind of money these companies are charging for boats these days, imho.