Easton's Bible Dictionary (1897)
The Authorized Version understood the word ‘adarkonim (1 Chr. 29:7; Ezra 8:27), and the similar word darkomnim (Ezra 2:69; Neh. 7:70), as equivalent to the Greek silver coin the drachma. , which was first struck by Darius, the son of Hystaspes, and was current in Western Asia long after the fall of the Persian empire.
Smith's Bible Dictionary (1863)
[Daric]