Does annyone know how to rename games installed on the K800i like the title says because i am lost

There's the only way to modify the title of the game before it is uploaded to your cell phone - open the jar file with WinRAR, WinZIP or other decompression application supporting jar (actually jar is the renamed ZIP compressed file), find Manifest.mf file (META-INF folder), open it with notepad, modify midlet name, save it again in the archive, and here you go - upload it to the handset and install with a different name.

I don't know the way, but maybe is it lik Abominog says,(thanks for that)
But i am sure that you can modify the game name, cause i have games in my phone with the web site name where i get it from

try renaming the installation jar file and then installing the game after that may work!