Themes Development – How to get a complete mother tongue instead of iso?

I do not use WPML nor Polylang, but several sites to create multiple languages. The code below is used to create a language selector, but I want a second menu with the full name of the language for a different menu (ie the EN should be English, French – English , DE – German). WordPress has the native names stored (because when you select a language you get a list with the name of the native language), but how can I access it to use it?

$ languages ​​= get_available_languages ​​();
foreach ($ languages ​​as $ item) {
$ iso = substr ($ item, 0, 2);
echo & # 39;
  • & # 39 ;. $ iso.
  • & # 39 ;; }