His real name is Judah or Judas and Didymus, and Thomas are his nicknames, one Greek and one Semitic or Aramaic.

所以他的真名叫犹太或犹大，低土马以及，多马是其昵称，一个为希腊语，一个为闪语或亚兰语。

KJV: There were together Simon Peter, and Thomas called Didymus, and Nathanael of Cana in Galilee, and the sons of Zebedee, and two other of his disciples.

新译本：当时西门。彼得、称为“双生子”的多马、加利利的迦拿人拿但业、西庇太的两个儿子，和另外两个门徒都聚在一起。

Didymus is the Greek word for "twin" and Thomas is from a Semitic word,either Hebrew or Aramaic, or Syriac,which are all three similar languages, "Thomas" would look like in "twin" in those.

低土马就是希腊语的“双生子“,“多马“来源于闪语，希伯来语或亚兰语，或者叙利亚语，这三种都是很相似的语言，“多马“在这些语言中也有“双生“的意思。