Meaning/pronuncation of 祢
新华字典 only gives mí, meaning the temple of one's deceased father, an ancient word.

Also in some Christian texts, 祢 is used as a variant of 你 to address the god, I'm not sure but I think it's because the character 祢 happens to be 神 and 你 combined. In this case, of course, it's pronounced same as 你.

Neither meaning is widely used today. In fact, the most possible place where you may still see this charactor is 祢衡, name of a Chinese historical figure.