The name Thomas is primarily a male name of Greek origin that means A Twin.In the Bible, Thomas is an apostle of Christ.The most common nicknames for Thomas are Tom and Tommy.Famous people named Thomas include Thomas Edison, inventor. Tom Hanks, actor. Tom Hiddleston, actor. Tom Cruise (nee Mapother), actor. Thomas Jefferson, 3rd President of the U.S., Tom Jones, singer. Tom Selleck, actor. Tommy Lee Jones, actor. Thomas Aquinas, Italian Dominican friar, Philosopher, Catholic priest, and Doctor of the Church. Tom Clancy, author.