I've tried a few things with the OnLivingEntitiyDeath event but every time I get the player it also gets the kills from other players online

I also want to check the mobs name (not the default name the custom name)

I cant reply with my code rn bc I am on my phone

Using the event, just check for who the player is, using their unique id.

And you can get the custom name for a mob by using the Entity#getCustomNameTag which you can easily do by getting the killed entity in the event.

16 minutes ago, Angercraft said:

Using the event, just check for who the player is, using their unique id.

No.

 

event.getSource().getTrueSource()

I'm using 1.8

37 minutes ago, Draco18s said:

No.

 

event.getSource().getTrueSource()