🔼The name Jecoliah in the Bible
These two names: Jeciliah (יכיליה, 2 Chronicles 26:3) and Jecoliahu (יכליהו, 2 Kings 15:2), apply to one and the same person, namely the mother of king Azariah of Judah and the wife of king Amaziah (2 Kings 15:2), who is commonly called Jecoliah in English translations. In the parallel text of 2 Chronicles 26:3, the young king is called Uzziah and his mother is called Jeciliah.
🔼Etymology of the name Jecoliah
These names all consist of two parts. The final bit is formed by the familiar appellative יה (Yah) = יהו (Yahu) = יו (Yu), which in turn is the truncated form of the Tetragrammaton, or the personal name of God: יהוה, YHWH, or Yahweh.
The first part of the names Jecoliah, Jeciliah and Jecoliahu comes from the verb יכל (yakol) meaning to be able or prevail:
These names would thus mean something like The Lord's Ability, or Yah Will Prevail, or Prevalence Due To God.
The variation in this name may not have to do with inaccuracy or inconsistency, but rather with the rich array of words that any Hebrew audience would have certainly been reminded of:
For a meaning of the name Jeciliah, NOBSE Study Bible Name List reads Yahweh Will Enable, and for Jecoliah NOBSE reads Yahweh Is Able. Jones' Dictionary of Old Testament Proper Names reads Made Strong Of The Lord for both. BDB Theological Dictionary reads Yah Hath Been Able for both.
BDB makes mention of an unearthed Sabean name יבלאל, which is obviously similar to our name Jecoliah, except that the Yah-part is now El.