Let me show some examples:
The app to browse the web is called Safari. As in your Mac or iPod.
The app for email is called Mail. As in your Mac or iPod.
The app to organize picures is called Photos. NOT iPhoto as in your Mac.
The app to play and organize your music files is called the iPod app. NOT iTunes.
And the name iTunes seems reserved for the app to browse and buy music from the iTunes music store. However, iTunes does all those things on your Mac (I mean organizing & playing your personal library of music files, and also browsing & buying songs from the iTunes music store).
Pretty confusing if you ask me. I wonder whether this means something that escapes me, or it is just due to a lack of care in the overall strategy for naming apps.
Or maybe it simply reflects that the iPad is in the middle of iPod Touch and a Macintosh, and they were not sure what of both products should be the model to follow when putting names to apps.