:I'm sure this has been heavily discussed before; somebody wanted badly to move it to İstanbul back in 2005 but it was always moved back (], ). Proposing this move again now would very likely be quite controversial. Our rule is that we normally use whatever spelling is more common in English; whether that includes leaving out diacritics where English writers usually do so is a bit of a contentious area. Please don't make unilateral changes in this area without obtaining consensus first.