What is the X in X-mas?
from Greek Thomas, of Aramaic origin and said to mean "a twin" (John's gospel refers to Thomas as ho legomenos didymos "called the twin;" cf. Syriac toma "twin," Arabic tau'am "twin"). Before the Conquest, found only as the name of a priest. After 1066, one of the most common given names in English. Doubting Thomas is from John xx:25; A Thomist (1530s, from Medieval Latin Thomista, mid-14c.) is a follower of 13c. scholastic theologian St. Thomas Aquinas. (Also see Tom, Tommy).
Thomas Thom·as (tŏm'əs), E(dward) Donnall. Born 1920.
American physician. He shared a 1990 Nobel Prize for developing techniques of transplanting bone marrow.
twin, one of the twelve (Matt. 10:3; Mark 3:18, etc.). He was also called Didymus (John 11:16; 20:24), which is the Greek equivalent of the Hebrew name. All we know regarding him is recorded in the fourth Gospel (John 11:15, 16; 14:4, 5; 20:24, 25, 26-29). From the circumstance that in the lists of the apostles he is always mentioned along with Matthew, who was the son of Alphaeus (Mark 3:18), and that these two are always followed by James, who was also the son of Alphaeus, it has been supposed that these three, Matthew, Thomas, and James, were brothers.