🔼The name Jeatherai in the Bible
The name Jeatherai occurs only one time in the Bible. In 1 Chronicles 6:21 he's mentioned as a son of Zerah. In verse 41 we meet another Zerah, whose son is called Ethni. Both Zerahs descend from Jahath, the son of Gershom, son of Levi, and this prompts countless scholars to assume that Ethni and Jeatherai are the same person. This is, of course always possible, and many players in the Bible have two names, but it doesn't seem necessary or even implied by the Chronicler, who seems to imply that Jeatherai and Ethni are distant cousins.
🔼Etymology of the name Jeatherai
The origin of the name Jeatherai is not immediately clear, but it seems to come from the verb יתר (yatar) meaning to remain over, be a rest:
For a meaning of the name Jeatherai, NOBSE Study Bible Name List reads a rather forced Steadfast. Jones' Dictionary of Old Testament Proper Names proposes He Will Abound Of The Lord.