🔼The name Tebaliah in the Bible
The name Tebaliah is actually spelled as Tebaliahu but generally transliterated, as per convention, without the final -u. It occurs only once in the Bible, namely in 1 Chronicles 26:11 in the list of Davidic gatekeepers.
Tebaliah is listed as the third of four sons of Hosah the Merarite. Tebaliah's brother Shimri was not the first-born but was given the status of first-born son for undisclosed reasons (which reminds of Judah's acquisition of that same station).
There is, therefore, a reasonable chance that Tebaliah was the actual first-born son of Hosah who somehow managed to forfeit this position.
🔼Etymology of the name Tebaliah
The name Tebaliah consists of two elements, the final one being יהו (Yahu), which is an abbreviated form of the Tetragrammaton יהוה, YHWH, or Yahweh.
The first part of our name comes from the verb טבל (tabal), meaning to dip:
For a meaning of the name Tebaliah, NOBSE Study Bible Name List reads Yahweh Has Immersed, Jones' Dictionary of Old Testament Proper Names has Baptized Of The Lord and BDB Theological Dictionary proposes Yah Hath Dipped.