From the Hebrew name דָּנִיֵּאל (Daniyyel) meaning “GOD is my judge,” from the roots דִּין (din) meaning “to judge” and אֵל (‘el) “God.” Daniel was a Jewish prophet whose story is told in the Book of Daniel in the Old Testament. A noble young Jew from Jerusalem, he is taken into captivity by Nebuchadnezzar in Babylon and serves the king and his successors with loyalty and skill until the time of the Persian conqueror Cyrus, always remaining faithful to the GOD of Israel.

There are three or four Daniel’s mentioned in the Bible:

A son of King David who is also known as Chileab (1Chronicles 3, 1 and 2Samuel 3, 3).
The famous prophet who wrote the Book of Daniel and was among the first exiles to Babylon (Daniel 1, 6). Jesus refers to this Daniel in his sermon on the coming tribulation (written Δανιηλ; Matthew 24, 5 ; Mark 13, 14). The prophet Ezekiel calls this man דנאל or Danel (Ezekiel 14, 14 ; 14, 20 and 28, 3).
The third (perhaps related to the second) is mentioned among the second wave of returning Israelites (Ezra 8, 2).
A “great sage,” according to the BDB Theological Dictionary, who may be the same as the famous Daniel, except that his name is דנאל (Danel; without the yod) instead of the regular דניאל (Daniel). Ezekiel mentions this in Ezekiel 28, 3.