Two types of names for ‘Turkish delight’ are known in the Slavic languages: rahat-lokum ~ ratluk, and lokum. Even though most etymological dictionaries derive them from the same Arabo-Turkish etymon, their different structures are not discussed and the phonetic differences not explained. The aim of this paper is to establish the relative chronology of changes made to the original phrase, as well as to point out some problems which still remain more or less obscure.