* מֵאִיר (Me'ir): This is the most common and likely spelling, meaning "illuminator" or "enlightener."
* מֶאִיר (Me'ir): This is a slightly different vowel pointing, but still means the same thing. The difference is subtle and often insignificant in practical usage.
Therefore, while מֵאִיר is the most frequently used, either of these could be correct depending on context.