🔼The name Mikneiah in the Bible
There's only one man named Mikneiah in the Bible. He was one of the Levites "of the second rank" who partook in the ceremony surrounding king David's transportation of the Ark of the Covenant from the house of Obed-edom to Jerusalem (1 Chronicles 15:18). Mikneiah and his colleagues led the procession strumming lyres tuned to sheminith (1 Chronicles 15:21).
Note that our name is really Mikneiahu. The "u" or waw at the end is a very common extension of names that end with יה and most of these names exist in both forms (with and without the final waw). English translations generally choose to ignore the final waw wherever it occurs, and that's why we know this man as Mikneiah and not as Mikneiahu.
🔼Etymology of the name Mikneiah
The name Mikneiah consists of two elements, the final one being יה (Yah) = יהו (Yahu) = יו (Yu), which in turn are abbreviated forms of the Tetragrammaton יהוה, YHWH, or Yahweh.
The first part of our name comes from the extensive root cluster קנה and קין and קנן:
All sources we commonly consult derive the name Mikneiah from the verb קנה (qana), meaning to acquire or create. For a meaning of the name Mikneiah, NOBSE Study Bible Name List reads Possession Of Yahweh and BDB Theological Dictionary (which indeed lists Mikneiah under the verb קנה) has the similar Possession Of Yah. Jones' Dictionary of Old Testament Proper Names proposes the more traditional Possession Of The Lord.