🔼The name Jorai in the Bible
The name Jorai occurs only once in the Bible. He is mentioned among the sons of Abihail, son of Huri of Gad, who lived in the land of Bashan (1 Chronicles 5:13). It's not clear at what time these men lived. The Chronicler submits that their names were enrolled in genealogies during the times of king Jotham of Judah and king Jeroboam of Israel, but these men may have lived long before that time.
🔼Etymology of the name Jorai
The consulted sources appear to agree on the verb from which the name Jorai was derived but the final interpretation vary considerably. The verb is ירה (yara), which in the Bible means to throw, cast or shoot, but which in other languages may have to do with to found:
The letter י (yod) upon which our name ends, may either create an adjective (rainy), a possessive form (my teaching), 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 Jorai, NOBSE Study Bible Name List goes for the adjective and reads Rainy. Alfred Jones (Dictionary of Old Testament Proper Names) thinks the verb means to found and takes the final yod to be a mark of the Deity: He Will Be Built Up Of The Lord. BDB Theological Dictionary interprets the verb in the sense of to teach, and also takes the yod to be a remnant of YHWH, and proposes Whom Yah Teacheth.