This name is not pronounced like mah-ee in Japanese. It's pronounced similar to "my" but obviously not so American. The letters ai together make a unique sound. (Of course they don't separate the vowels from the consonants and the katakana is one character, with the m.) This happens a lot with names that end with I (though you must remember that this is transcribed into English letters.) Names like Rei aren't pronounced Reh-ee either, it's more like "ray" like a ray of sunshine.