The origin of the names of five brothers and two sisters are a matter of dispute. They are often considered to be of non-Slavic origin, and genuine names, as the anonymous Slavic narrator (probably a Croat) couldn't invent the non-Slavic names of their ancestors in the 9th century. J.J. Mikkola considered them to be of Turkic-Avar origin, Vladimir Košćak of possible Iranian-Alanic origin, Karel Oštir as pre-Slavic, while Alemko Gluhak saw parallels in Slavic Old Prussian and Baltic languages. Stanisław Zakrzewski and Henri Grégoire rejected Turkic origin, and related them to Slavic toponyms in Poland and Slovakia, while Josip Modestin connected their names to toponyms from region of Lika in Croatia, where early Croats settled. According to Gluhak, names Kloukas, Lobelos, Kosentzes and possibly Mouchlo don't seem to be part of Scythian or Alanic name directory.