🔼The name Mehujael in the Bible
Our name Mehujael occurs only twice, both times in Genesis 4:18, but in two versions: מחויאל (Mehujael) and מחייאל (Mehijael). This may seem a bit curious, but it's very common in the Hebrew Bible to use two variations of the same name in one statement. Translations commonly choose to call this man Mehujael, but that's a mere arbitrary preference.
🔼Etymology of the name Mehujael
The name Mehujael seems to be a compilation of two elements, the final part being אל, the common abbreviation of Elohim, the genus God:
The first part of the name Mehujael seems to have to do with the root group מחה (maha I & II) either meaning to wipe out, or to strike:
For a meaning of the name Mehujael, Jones' Dictionary of Old Testament Proper Names reads Destroyed Of God. NOBSE Study Bible Name List proposes Smitten Of God.