Daniel was derived from the Hebrew name Daniyyel, from the elements din, meaning "judge," and ’el, "God." The Book of Daniel in the Old Testament describes the Jewish prophet’s life of captivity in Babylon and visions of the last days of Earth. Dan and Danny are common short forms of Daniel.

While Daniel is the usual male form of this usually male Biblical name, it's a Top 100 name for girls in Israel. In most cultures, Daniel is feminized to Denielle or Daniela when used as a girls' name. There were 16 baby girls named Daniel in the US in 2020, so it's use is not unheard of beyond Israel.