Yeah there is an article about that in Wiki too Pre Greek substrate The ulis suffix however poses no problem to include it as an IE suffix you will find such suffixes throughout IE and they are traced back to PIE Latin ula Alb ull Greek ule kotyla in Slavic there is proto Slavic sedulo Germanic sadulaz English saddle etc etc In Greek ulis does not appear to be that common but ule arbule is common enough If someone were to collect all the ulis examples in Greek you probably won t find any indication of a pre IE origin for it and even a Thracian or Illyrian origin may not fit the data It s probably native to Greek or some Greek dialects In the case of bombylis and arbylis bomb here means bubble or some such Greek pomphos bubble and such forms are found in IE French pompon of obscure origin non IE I think while arb meaning curved arched may also be IE I just haven t checked yet Anyway these Greek suffixes don t prove that it is also a suffix in Bardylis but that s more likely than a two word compound