Your application name is actually defined in AndroidManifest.xml in its first lines. Example:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.yourcompany.appname"
android:versionCode="66"
android:versionName="0.57" >
Pay attention to the package = "com.yourcompany.appname" - this is your package definition.
Other places containing the name of your package may be resources, class paths, packages, etc. But they should all be aligned according to the manifest, because this is what the package manager reads.