Actually I have a friend who's been a resident there for a few generations (and this is a very rare thing in İstanbul where everybody's coming from somewhere). That district used to not really be commercial or residential during the youth of my friend's grandfather, full of orchards and the occasional weekend house and the nearest settlement is a small sleepy village some miles away. So when this grocer opened up shop there, people thought he's a bit stupid and confused to start a business there. Then, when somebody needed to describe that area they'd say "to the confused grocer", "around the confused grocer" etc. In time that caught on, and the area became crowded (because of a wave of internal migration, lax zoning code, highway coming close etc) so it became the name for the entire neighborhood. The joke's on whoever thought the grocer was confused, I guess
By the way I remember another stupid district name story. In my hometown there are 2 neighborhoods called 4 1/2 stops and 5 1/2 stops. Rapıd industrialization caused people to move to the city center from villages to work in factories so some areas urbanized fast, and didn't have names yet. When bus service started there, they just called the stops after named neighborhoods 4th stop, 5th stop etc. Without better alternatives, those neighborhoods just started to be called by those names. Fast forward to another wave of internal migration caused by people fleeing ethnic tensions elsewhere when there became more crowded more frequent stops were needed, but the numbers were already assigned so they started calling the intermediate stops 4 1/2th stop, 5 1/2th stop etc. This was late 90s. Now those are proper neighborhoods and the city got so much bigger those can be regarded as city center, and still called 4 1/2 stop neighborhood.