What does ELO stand for in the ELO rating for chess?

Question

What does ELO stand for in the ELO rating for chess?

Answer 1

ELO is the last name of the man who constructed the rating system, Dr. Arpad Elo.

Answer 2

"Elo" is often written in capital letters (ELO), but it is not an acronym. It is the family name of the system's creator, Arpad Elo (1903–1992), a Hungarian-born American physics professor.

Elo was originally invented as an improved chess rating system although it is used in many games today. It is also used as a rating system for competitive multi-player play in a number of computer games, and has been adapted to team sports including international football, American college football and basketball, and Major League Baseball.