I want to add villager a names, I don't know if this will works on 1.12.2, will this be compatible without the lib?

Yes the 1.12 version should work! Collective is not needed. The main difference with the newer version is that it doesn't have support for modded villagers. Thanks for the interest!

https://www.curseforge.com/minecraft/mc-mods/villager-names/files/2812899