🔼The name Mebunnai in the Bible
The name Mebunnai occurs only once in the Bible. Mebunnai the Hushathite was one of David's mighty-men (2 Samuel 23:27). It's probably reasonable to assume that Mebunnai is the same man as סבכי, or Sibbecai the Hushathite, mentioned in the Chronicler's list of David's mighty-men (1 Chronicles 11:29).
🔼Etymology of the name Mebunnai
The name Mebunnai comes from the verb בנה (bana), meaning to build, or perhaps from the derived noun מבנה (mibneh), meaning structure:
The letter י (yod) upon which our name ends, may either create an adjective (building-like), a possessive form (my building), 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.
For a meaning of the name Mebunni, NOBSE Study Bible Name List simply reads Built. Jones' Dictionary of Old Testament Proper Names regards the final י (yod) as a remnant of יהוה and reads Building Of The Lord. BDB Theological Dictionary does not interpret our name but does list it under the verb בנה (bana).