In Turkish, the reply to your question generally depends on whether or not a group of people from a certain geographical area have their own unique language,
1. İf they dont have their own unique national language: examples are Amerikalı, Şilili, Pakistanlı etc. (with "lı", "li", whatever)
2. If they have a unique national language of their own: examples are Fransız, İngiliz, Türk etc.(no "lı" or "li" )
Just as terms like "Ingiltereli" or "Fransalı" are not often used, the term "Türkiyeli" too is out of order.
(This definition is by İlber Ortaylı
Every rule has exceptions? Portuguese is its own language, we say Portekizli though.
In actual fact the Turkish use of İngiliz for anything British is wrong and annoys Scots Welsh and Northern Irish who don´t think of their embassy as English nor do they fly on English Airlines (flight code BA)!
