Spellings
Ah, good question - there's quite a few (doubtless a result of the European tongue trying to wrap itself around asian words). Francois Bernier spelt it "Tage Mehale" other alternatives might be "Tadj Mahal" (Chaghtai writing in french), as recently as Bannister Fletcher I think it was spelt "Tag Mahal". There was a British East India company employee who witnessed the construction called Peter Mundy  who described it, I think as "Tage Mehele" There's some more - I'll get back to you tonight when I've got my books with me.