Is there any way to rename app name in lauchpad? I have 3 eclipses installed on my mac eclipse jee, eclipse for android and eclipse for php.
all three eclipses are cooming in launchpad with the name eclipse.
Is there any way i can rename app name like 
eclipse jee, eclipse php, eclipse android in launchapad?
You can by using an Administrator account and renaming the apps in Finder. LaunchPad will show the changed name accordingly.

There also is this app, which seems to make renaming items and other operations in LaunchPad possible. Unfortunately, it seems to be discontinued, so try it at your own risk.

Finally, if you are comfortable with SQLite databases and SQL, you could manually make the necessary changes in the LaunchPad database. I'd advise you to first back up your database before you start tinkering with it. You can use the built-in sqlite3 command-line client to manipulate this database. You'll want to find the appropriate records in the apps table, and update their title field.