Strictly speaking none of these are really needed I think,though they may include useful defaults. They don't look like the normal ~/.profile files and so forth that get loaded by ksh or what have you, but remember, shell profiles are scripts -- they can instruct your shell to run commands, including creating files and sourcing things your shell wouldn't otherwise do by default. I think that, either on login or logout, one of your global profile scripts is copying them in from defaults somewhere.

The .cshrc and .login are for csh, the c-shell, which has a very different syntax from the bourne shell hence can't use the same login scripts. It also has its own equivalent of /etc/profile somewhere, though its exact name depends on your variety of csh.

The ~ files look like backups. cp makes files like that when you do cp -b source destination when destination already exists, the old file will be renamed to destination~ and the new one put in its place.