God's name is written as the Tetragrammaton יהוה (YHWH) in the Torah. The name is not vocalized in the manuscripts and I know it's considered ineffable by Jews and thus not said aloud. For that reason, the original pronunciation hasn't been preserved (as far as I know).
Christians commonly suggest the pronunciations Yahweh and Jehovah (which should of course be pronounced like "Yehovah"). Long ago I heard it claimed that the vocalization Jehovah is based on a misunderstanding, but I don't remember the reasoning.
What is the probable original vocalization?