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Alternative proposals for the etymology of *Slovenin propounded by some scholars have much less support. Lozinski argues that the word *slava once had the meaning of worshipper, in this context meaning "practicer of a common Slavic religion," and from that evolved into an ethnonym. S.B. Bernstein speculates that it derives from a reconstructed Proto-Indo-European *(s)lawos, cognate to Ancient Greek laos "population, people," which itself has no commonly accepted etymology. Meanwhile, others have pointed out that the suffix -enin indicates a man from a certain place, which in this case should be a place called Slova or Slava, possibly a river name. The Old East Slavic Slavuta for the Dnieper River was argued by Henrich Bartek (19071986) to be derived from slova and also the origin of Slovene.

Who said slava evolved from an ethnonym?
unanswerable