|Easton's Bible Dictionary|
Silver, a place between Babylon and Jerusalem, where Iddo resided (Ezra 8:17); otherwise unknown.
Int. Standard Bible Encyclopedia
ka-sif'-i-a, ka-sif-e'-a (kaciphya'): A place in North Babylonia, near the river Ahava, to which Ezra sent for "ministers for the house of our God" (Ezra 8:17). Some have thought the name to be connected with keceph, "silver" or "money." Septuagint renders argurio tou topou, as in 1 Esdras 8:45, "the place of the treasury."
Casiphia (1 Occurrence)
Ezra 8:17 I sent them forth to Iddo the chief at the place Casiphia; and I told them what they should tell Iddo, and his brothers the Nethinim, at the place Casiphia, that they should bring to us ministers for the house of our God. (WEB KJV JPS ASV BBE DBY WBS YLT NAS NIV)