* mee-ma: This is the most common pronunciation, especially in the US. It's a simple two-syllable word with a short "ee" sound like in "see."
* mee-mah: This pronunciation is sometimes used, especially in some European languages, with a slightly longer "ah" sound at the end.
Ultimately, the best pronunciation will depend on the specific word or name you are referring to. If you are unsure, it's always best to ask the person who uses the name or to check a dictionary.