Uuh, yes... Now you mention it, I think I remember having read something about naming trouble with de_egypt. Somehow the map was going to be renamed to de_gypt from some version on, but it was very confusing - especially since the map is actually nothing more than an early verison (or a modification) of de_legato. And de_legato is the only one around with this name. Maybe Lazy (the mapper) decided to choose a completely different name to end the confusion, and while he was at it, made some redesigns to improve gameplay... just speculation, of course.
Anyway, what matters is that you got it now, so you'll be able to play it - and maybe assist me in nagging poor Huntakillaz into tweaking his WP again and again...
(my sadistic vein is showing again...)