Random Info of the day:
At first, κεράσι and cherry didn't seem that similar to me. But
The word κεράσι comes from Black Sea city Cerasus ( Κερασούντα, which got it's name from the ancient greek word "Κέρας"= Horn, as the shape of the peninsula the city was situated on was horn shaped). This is were cherry trees were first cultivated.
Lucullus brought it from Cerasus to Rome and named it cerasus, after the city. The fruit was named cerasium, then ceresium and ceresia in later Latin. This is where the french cerise and the english-norman cherise came from. The last one was mistakenly thought to be a plural, so the -s was removed in later english and here we have the medieval english chery, and finally cherry.
(Everything makes sense after all.)