sure you are right in that manner,
but dont forget, we are comparing the letters with the letters of those times. so sure there was no ''j''
we are talking about 500bc. there was no latin alphabet in wales in those times in wales right?
there was no ''Turkiye'' since 1928 when we started to use Latin Alphabet in Turkey.
but this does not mean that the word ''Turkiye'' did not exist, right? so alphabets change but concepts live, also ''language speaken''..
cheers
ps: those celts story, that they are coming to anatolia is a fact as far as i can see, i can give academic references easily.
but yes, this ''turkije'' thing, i ve heard that from a guy called ''m. altundal'' he has books in english also you may check. so, yes, my only reference about this ''turkije'' thing is him... but he has a great reputation for me.