The word balık=şehir is outdated and I'm positively sure that there are almost nobody in Turkey who knows that balık meant city in the past. Also there's that information which Mahmud of Kashgar says that only polytheist Turks called cities as balık and he also wrote that those Turks (probably some people living among Russians, Slavs, Chinese, Greeks) stopped being Turks in the past. (for God knows what reason (maybe because they became polytheist)... Probably things were different in the past)
There are many possibilities to what the word originally could have been due to changes that happen in Turkish. For example It could have been Bağlık (connection or somewhere which ties two places together like a threshold or place with many yards or a place that looks like a yard or well-kept place) (Ğ actually is a letter which conglutinates the letter before it and the letter after it together). I think it meant protected place like a castle in which people hoarded wealth.
when I say "balkan", it sounds to me like "something consisting of mud" but I can't know how people perceived it in the past.
I guess that the trick is to see the connection between bal (honey) and balk (mud). The structure of both materials is similar. They are thick and they are used for building homes. One used for human homes, the other used for bee homes.
So BAL (and maybe some other forms of the word) in my opinion meant something which was related and close to city, things used to build a city, city founder, city dweller, abundance, place where wealth is collected (related to BOL:abundant).
This is from another Turkic etymology dictionary; this time from Azerbaijan.
http://www.turuz.com/sozluk.aspx?dict=arin&q=balqan
balqan:
balğan.
◊ (< bal). iti. kəsərli.
◊ qızqın.
◊ iyit. pəkləvan. pəhləvan.
◊ məncənaq.
◊ balığ xan. balığ, şəhər xaqanı.
◊ sarp, uzanan hündür dağ.
◊ tuğay. çəkələk. cəngəl. urman. ğaba. meşə. biqşə. bükşə {bişə (fars) < bük).
balkan. sıx ormanlı, sarp sıradağlar.
balğan. balkan. qalğan. uca. yüksək. -balqan dağlar.
qızqın (kızgın in Turkish): angry
iyit (yiğit in Turkish): brave, honorable, valiant, daredevil, red-blooded
məncənaq: (mancınık in Turkish): catapult
şəhər xaqanı (şehir hakanı in Turkish): controller, regulator of a city
cəngəl (çengel): fork, hook
urman (orman):forest
ğaba: (kaba) rugged, rough, vulgar, brute, rude, barbarous, uncivilized, ...
meşə (meşe): oak
bük: twist, bend, curve, hook, ...
and also the same rugged-steep mountains with forests.
Here is a verb: balqanlaşma (laş: like- to become like. ma: to)
http://www.turuz.com/sozluk.aspx?dict=arin&q=balqanlaşma
balqanlaşma:
balkanlaşma. ( < balmaq: bölmək). ayrışma. parçalanma. təcziyələnmə. bir topraqda çeşitli neçə devlətə bölünmə.
bölmek (to divide, to break down, to split, to parcel out...)
http://translate.google.com/#auto|en|bölmek
ayrışma: to dissolve (and connect together stronger in smaller quantities "for example like cement"). decomposition, dissociation,
parçalanma: to break down into smaller components
PS: I guess that balgam (mucus, spit) is related to this as well because in the past people divided lands by spitting on the ground. People might have thought that just like mucus breaks the food we eat into smaller components for our body, it also divided lands among different people... Found this:
http://en.wikipedia.org/wiki/Vistula_Spit
it says
to become divided into many different countries on the same land.
təcziyələnmə: to become a lesser political entity. (for example from empire to country to state to city to district to village...)
I guess all of the above shows us that Balkan - Balıq (city) and Polis are related words. This would make Balkan both a Turkish word and also a Greek word in its essence. (since poly : bol, ~böl and polis : balıq). For an empire to become divided into many city states, it has to "balkanlaşmak".
All the problem lies within finding the true etymology of the word balıq:city. I have been trying to figure it out for a long time. Maybe the people who built balıqs were tyrans who hoarded the wealth of people who lived around the balıq inside the balıq and that's why balqan also means catapult (catapults were used against the castles) ? And the people who built balıqs were also law makers as a result balqan was also called city regulator?
Ordu Balıq : The fortress of the army-horde?
Beş Balıq: Five castles?