🔼The name Ehi in the Bible
The name Ehi occurs only once in the Bible (although it's spelled the same as the name Ahi), namely as a son of Benjamin according to Genesis 46:21, and one of the sixty-six proto-Israelites to make it to Goshen in Egypt.
The name Ehi doesn't occur anywhere else in the Bible and it's been suggested the this Ehi is the same as Ahiram, son of Benjamin mentioned in Numbers 26:38, or the Aharah mentioned in 1 Chronicles 8:1, or the Aher mentioned in 1 Chronicles 7:12, or even the Ehud mentioned in 1 Chronicles 8:6. This remains conjecture, however, and any discussion of this conundrum would hinge on the question of why a man would have so many different names.
🔼Etymology of the name Ehi
The name Ehi appears to come from the word אח ('ah), meaning brother:
The letter י (yod) upon which our name ends, may either create an adjective (brother-ly), a possessive form (my brother), or may be a remnant of יה (Yah), which is short for יהוה, which is the name YHWH, or Yahweh, and form Brother (Friend) Of Yah.
For a meaning of the name Ehi, NOBSE Study Bible Name List goes with the adjective and reads Brotherly. Jones' Dictionary of Old Testament Proper Names sees in this name a possessive form and proposes My Brother. BDB Theological Dictionary doesn't offer a translation of this name and lists it alphabetically and not below a particular root (assuming that BDB does not suggest that this name means My Fire-Pot).