Dr. Isles' middle name in Dorothea.
In Croatian, "Cutthroat" is "Koljach". It is pronounced the same in Serbian, but in that language is spelled with Cyrillic letters. It is impossible to distinguish whether the single letter "K" is in the Roman alphabet or the Cyrillic.
Sasha Alexander is Serbian by decent and she speaks the language fluently. So she was really speaking it as Dr. Isles.