Can i still use the name tricks ?

You get to use the name trick once per eeveelution.
So 1 for a Vape, 1 for a Flareon, 1 for Jolteon and the Gen2 gets 1 each as well.

You can only use a name trick for all Eevelution for one time. But you can still obtain Umbreon and Espeon by choosing them as your buddy for at least 10KM. And evolve them while still your buddy. When you evolve them during night time = Umbreon and daytime = Espeon.. Good Luck!