Bible dictionaries
Bithiah
What Bible dictionaries say about “Bithiah”, one article after the other.
International Standard Bible Encyclopedia (ISBE 1915)
bi-thi'-a (bithyah; Beththia; Codex Vaticanus, Gelia, "daughter of Yah"): The daughter of a Pharaoh who married Mered, a descendant of Judah (1Ch 4:18). Whether this Pharaoh was an Egyptian king, or whether it was in this case a Hebrew name, it is difficult to say. The name Bithiah seems to designate one who had become converted to the worship of Yahweh, and this would favor the first supposition. If, as the Revised Version (British and American) reads, the other wife of Mered is distinguished as "the Jewess" (instead of the King James Version "Jehudijah"), this supposition would receive further support.
Frank E. Hirsch
International Standard Bible Encyclopedia — James Orr, general editor and contributors; CrossWire SWORD module ISBE 2.2
The article in ISBE 1915Smith’s Bible Dictionary
William Smith; revised by F. N. Peloubet and M. A. Peloubet; CrossWire SWORD module Smith 1.3
The article in Smith