Should it not be called ‘Water’ instead?

So here is a half-pondered thought I am just going to leave you with:

During the welcome reception at the ‘Imagining Earth’ conference we got to talking about the different denotations and connotations the terms Planet, World and Earth have … and the following tidbit came up: considering a) what we know about exo-planets, b) what we know about the other solid-state planets in our solar system, c) what the Earth looks like from space, and d) what makes life on this planet possible and this planet stand out from all the other planets we know … … … should ours not be called ‘Water’ (instead of ‘Earth’) ?
:-)