Bardhylis

*bherHg- ‘to shine; bright, white’, PIE form *bherHg’- is probably the root from which the Albanian bredh ‘fir, fir-tree’ was derived, as well as Romanian brad ‘fir’. Its perform was probably o-grade form *bhrog’-o > PAlb *bradza. From this root is also derived Old English birce(e) ‘birch’ from Germanic *birkjo:n- as well as Latin fraxinus ‘ash tree’. Generally this root is used to describe the ‘white tree’. From this root is also derived Alb adjective (i,e) bardhë ‘white’ probably from suffixed zero-grade form *bhr.H2g’-o, where *-r.H2- has yielded PAlb –ra- (see Cybalist). As adjective it is also used in personal names: Albert from OHG Adalbert ‘nobel bright’ (adal ‘nobel’), OHG Giselberht ‘bright hostage’, Herbert ‘bright army’ and so on (see Watkins AHDIR, p.11.). So, to claim that Illyrian king’s name Bardhylis is not derived from the adjective *bhr.H2g’-o, to my view, is nonsense. This adjective is also present in Romanian barza ‘stork; literally - white bird’ and I believe in Slavic patronymic Lubarda probably from lumbardha ‘female pigeon, bomb’ or (i,e) lubardhë ‘whitish, fair-hared, blond’. To me is very interesting its religious meaning ‘blessed’: i bardhi ti ‘blessed you’, e bardha ditë ‘blessed
day’ etc. I think that –is in king’s name Bardhylis is a masculine ending, till –yl could be a suffix, attested also in z-bërdhyl-un ‘whitish’ etc. Etymology Bardhylis ‘white star’ to my view is a folk etymology, made by Edwin Jacques in his book: The Albanians: An Ethnic History from Prehistoric Times to the Present (page 82.).

Konushevci

I agree here with you. Ur-basis of the Albanian 'bredh' (fir) and 'bardhë' (white) obviously was BR-GON (or the "root" *bherHg’-) as it was the source of other words, Albanian 'bredh' (wander), Albanian 'prag' (threshold; loan word from Serbian –prag-) or the English
'bread'. For instance, English bread probably came from OHG prioჳan (Latin frangere, Serbian prsnuti) but it could have also come from the English 'burn' (Serbian purenje); i.e. from 'brewing' (Serb. 'vrenje' yeast fermenting process). In fact, it doesn't matter (at all!) from
which of the three above "sources" bread appeared, because all the above processes are clearly and logically connected. There is no doubt that the Albanian 'bardhë' and English 'bright' are
the descendants of the same above progenitor. Nevertheless, I could not agree with you that ‘birch’ (Serbian ‘breza’) means “white tree” because ‘percus’ (“Perkūnas, Latvian Pērkons,
Prussian Perkonis, in name and function closely associated with the Slavic Perun, Hittite Peruna, Old Indic Parjānya” /Marija Gimbutas The Balts/) has the meaning ‘oak’. Most of the modern linguists believe that Latin ‘quercus’ is coming from ‘percus’; in reality, ‘quercus’ is related to Serbian ‘hrast’ and Celtic ‘Hercynia’, both from the basis HOR-GON. Perkunas, like Perun, Thor and Donnar, is a Thunder god and, as we know, thunder strikes the oak tree very often. Serbian ‘brest’ might be translated as ‘bel-hrast’ (elm; white oak), or it just happened to look so because is the tree of the god Bel. If we consider carefully the Serbian word ‘drvo’ we will see that this word comes from the ancient basis HOR-BEL (compare Russian дерево/ đerevo, Serbian ‘gorivo’ /fuel/, ‘ogrev’ /fuel/ and you will be able to grasp what I am talking about). Romanian ‘barza’ is coming from the same well spring as the Serbian word ‘roda’ (stork). In fact barza (roda, stork) is considered as to be the BIRD that BRINGS babies. As you see I intentionally
capitalized words BIRD and BRING trying to show you the way in which the English words BIRD, BRING and BIRTH are mutually connected (Serbian POROD = BIRTH). Hence, Romanian BARZA has nothing to do with your ‘white bird’?
Let me finish. I do also agree with you that no one with the sound mind would have ever claimed that Bardhylis was not derived from BR-GON basis (or your *bhr.H2g’-o “root”). The ur-basis BR-GON means literally ‘opposite driving’ and there from we have the Serbian words ‘obrtati’ (rotate), ‘obratiti se’ (address), ‘obrnuti’ (convert), ‘obratno’ (inverse), ‘vrteti’ (spin),
‘obratiti se nekome’ (come up to). If you were in trouble to whom would you come up to for help? Of course, probably you would have addressed first to your brother (Serbian BRAT). There are a lot of Serbian names and surnames that have been derived from the word BRAT
(brother) – BRACAN, BRATKO, BRATISLAV, BRATOVOJE, BRATOMIR, BRAJAN (medieval Serbian name, the same as today’s BRIAN in UK), BRATOLJUB (often nicknamed as BRATOJLE); and some other names (old and modern) as BRACA, BRAJO, BRALE, BRAJLE, BRAJILO.
According to the above analysis Bardhylis appears to be a clear Slavic name, and I admit, it opposes the official historic view about “the great migration of the Slavs” during the 6-7th century AD. It shows, together with the clear Slavic geographical names across the whole
Central and South Europe, that Slavs were indigenous Balkan people.