Interesting. I knew a lot of them. I Googled the rest, but I still don't know what Vlamm is.
Starting list: What languages call themselves (romanized)
Euskara -
Suomi - Finnish
Nihongo -
Français - French
Deutsch - German
Nederlands - Dutch
Vlamm -
Italiano - Italian
Ellenika - Greek
Castellano - Spanish
Cymraeg - Welsh
Norsk - Norwegian
Svenska - Swedish
Eesti keel -
Russkiy yazyk - Russian
Polszczyzna - Polish
Română - Romanian
Četina -
Guānhuà -
Mānak Hindī - Hindi
Tsalagi Gawonihisdi -
!Xun - African (unsure of region)
Sanumá -
Lakhota - Lakota
Türkçe - Turkish