🔼The name Zillethai in the Bible
There are two men named Zillethai (or Zilthai, as the King James and the Darby translations have it):
🔼Etymology of the name Zillethai
The name Zillethai probably comes from the root group צלל:
The letter י (yod) upon which our name ends, may either create an adjective (shadowy), a possessive form (my shadow), or may be a remnant of יה (Yah) = יהו (Yahu) = יו (Yu), which in turn are abbreviated forms of the Tetragrammaton יהוה, YHWH, or Yahweh.
Scholars (including the brilliant Gesenius) generally appear to prefer to see the final yod as a remnant of the Divine name.
The part of our name before the final yod could be regarded as an older spelling variant of the name צלה (Zillah).
For a meaning of the name Zillethai, NOBSE Study Bible Name List reads Shadow Of Yahweh and Jones' Dictionary of Old Testament Proper Names has the similar Shadow Of The Lord.
BDB Theological Dictionary does not offer an interpretation of the name Zillethai, but does endorse Gesenius' explanation of it being צלת יה.