Ah, but my good sir, these are all considered Elven tongues:

No, they're not, and anybody who tries to say otherwise is just plain wrong. Quenya, Sindarin and The Black Speech are all derived from elven, but that doesn't make them "one and only" any more than English and Sankrit are one because of both being derived from PIE. In the spirit of nitpickery/fanmania, it could also be pointed out that even in your glaringly incorrect response, you said that these are all considered elven tongues which in itself makes a mockery of your earlier "one and only" assertion. There are also dwarvish and Entish two definitely non-elven languages only sketchily developed by Tolkien.Baruk Khazâd! Khazâd ai-mênu!