ux e inos ▁pont os ▁= ▁" H osp itable ▁sea "). ▁The ▁op a / up a ▁element ▁is ▁valid ated ▁by ▁the ▁Lith uan ian ▁cogn ate ▁up ė ▁(" water "). ▁This ▁et ym ology ▁is ▁question ed ▁by ▁Russ u : ▁A xi op a , ▁a ▁name ▁att ested ▁only ▁in ▁Pro cop ius ' ▁De ▁A ed ific i is , ▁may ▁be ▁a ▁cor rupt ▁form ▁of ▁A xi opol is . ▁Even ▁if ▁correct , ▁however , ▁Russ u ' s ▁ob jection ▁does ▁not ▁invalid ate ▁the ▁de ci pher ment ▁of ▁the ▁ax i - ▁element . ▁ ▁A part ▁from ▁Dur idan ov ▁and ▁Georg iev , ▁other ▁sch ol ars ▁have ▁attempted ▁to ▁re construct ▁Da cian ▁and ▁Th ra cian ▁words . ▁Russ u ▁( 1 9 6 7 ) ▁attempted ▁to ▁de ci pher ▁Th ra cian ▁and ▁Da cian ▁on om astic ▁elements ▁( p lac en ames ▁and ▁personal ▁names ) ▁by ▁reference ▁to ▁pres umed ▁proto - Ind o - Europe an ▁roots - words . ▁Georg iev ▁cons iders ▁such ▁a ▁method ology ▁( known ▁as ▁W ur ze let ym olog ien ▁= ▁" root - et ym ologies ") ▁to ▁be ▁" de void ▁of ▁scientific ▁value ". ▁This ▁is ▁because ▁the ▁root - words ▁themselves ▁are ▁reconst ru ctions , ▁which ▁are ▁in ▁some ▁cases ▁disput ed ▁and ▁in ▁all ▁cases ▁subject ▁to ▁uncertainty ; ▁multiple ▁root - words ▁can ▁often ▁explain