Who are the first three persons to escape from the earths gravity?

if your definition of escaping earth's gravity mean that the earth is no lnger the single most influencial source of gravity than the answer is:

a three way tie between James (Jim) lovell, Frank Borman and Willian (Bill) Anders on the Apollo 8 mission.

If you mean the first persons to escape the earth-moon system than the answer is:

No one, no human has left the earth-moon systems' gravitational influence