: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. -ullë, 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.