köken: From Swedish solist. Also compare Italian solista and Spanish solista that have been formed the same way (as opposed to something like English soloist).
köken: Etymology tree Esperanto sola Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íďďō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Hellenic *-tās Ancient Greek -τής (-tḗs) Ancient Greek -ῐστής (-ĭstḗs)bor. Latin -istader. Esperanto -isto Esperanto solisto From sola + -isto.