Yellow wrasse, Halichoeres chrysus. Yes they will jump, don't bother having a fish of this genus if you do not cover your tank, as you will eventually find it on the floor.
They dive into the sand when scared or to sleep. Expect the wrasse to stay buried for the first day or so when introduced, and sometimes it takes them a good while to get used to your lighting schedule. Mine was coming out at noon for about a week before he started getting up when my lights came on.
A very nice fish. Mine eats about anything I feed him, and is very peaceful.
I have glass covers on my tank.