The prevailing Y-DNA haplogroup I is native European, but not native to Balkan. Bronze age Balkan cultures (ancient Greeks, Illyrians, Macedonians etc) are made from people who came from Middle East, they were not Indo-Europeans.
Y-DNA of ethnic Macedonians is roughly as follows;
I = 30% E = 25% R = 25% J = 15%
So there is no clear winner here. Further north in ex-YU, I HG prevails peaking at over 50% in Bosnia for example. In Macedonia, we are more mixed, with Slavic R1a only about 12%. Those bronze age cultures have left a far greater DNA footprint in modern Macedonians than northern or eastern Europeans have. This is also prevalent in the phenotypes of modern Macedonians, who are mostly of Med types (Pontids, Dinarids, East Meds etc). Slavic Baltids and East Nordids are a minority in Macedonia.
That's all based on very small sample. I haven't yet saw a good Macedonian DNA project, like Serbian one. Also statement such as haplogroup I is higher the north you go is not really true. For example Serbs have highest amount of I1 (Nordic) among all Slavs, with about 15%, but its highest concentration is around western parts of Serbia - Montenegro border.
You've suddenly gone from extremely pro-bulgarian to extremely anti-bulgarian
Still pro-ancient-greek, still pro true-SLAVIC-Bulgaria, still of course pro-SERB (this last one is constant !!! )
The country's name, Bulgaria, is taken from the word Bulgars, an extinct tribe of Turkic origin, which created the country. Within Bulgaria, some historians question the identification of the Bulgars as a Turkic tribe, in favor of an Iranian origin.Their name is not completely understood and difficult to trace back earlier than the 4th century AD,")Alternate etymologies include derivation from a compound of Proto-Turkic bel ("five") and gur ("arrow" in the sense of "tribe"), a proposed division within the Utigurs or Onogurs ("ten tribes").
1)comes from the Czech word Čech. The name comes from the Slavic tribe (Czechs, Czech: Češi, Čechové) and, according to legend, their leader Čech, who brought them to Bohemia, to settle on Říp Mountain. The etymology of the word Čech can be traced back to the Proto-Slavic root *čel-, meaning "member of the people; kinsman", thus making it cognate to the Czech word člověk (a person).
2)The name of Croatia derives from Medieval Latin Croātia. Compare DUX CRUATORVM [sic] ("Duke of the Croats") attested in the Branimir inscription. Itself a derivation of North-West Slavic *Xrovat-, by liquid metathesis from proposed Common Slavic period *Xorvat, from proposed Proto-Slavic *Xŭrvatŭ (*Xъrvatъ) which possibly comes from Old Persian *xaraxwat-. The word is attested by the Old Iranian toponym Harahvait- which is the native name of Arachosia.
3)The name Raska is derived from the name of the region's most important fort, Ras which first appears in the work de aedificiis of Byzantine Procopius as Arsa prior to the forming of Serbia (Procopius, De aedificiis, IV 4). Ras eventually became the capital district and seat of the first bishopric of Serbia (the Eparchy of Raška and Prizren). The name of the bishopric eventually started to denote the entire area under jurisdiction and later, under Stefan Nemanja, Ras was re-generated as state capital and as such it has at times been used by some in historiography to refer to Serbia from the early 12th to the early 14th century.It had begun its use as an exonym for Serbia in Western European sources in the early 13th century, along with other names such as Dalmatia and Slavonia. The first attested appearance of the name Raška is in the Kotor charter (1186), in which Stefan Nemanja is mentioned as župan of Raška. Soon after Raška (Rascia) became an exonym for Serbia in western sources (Papacy, German, Italian, French etc.) often in conjunction with Serbia (Servia et Rascia). However, that name appears scarcely in medieval Serbian and never in Byzantine works to denote the state.
Between the 15th and 18th centuries, the term Raška (Rascia, Ráczság) was used to designate the southern Pannonian Plain inhabited by Serbs (Raci), who settled there during the late Middle Ages, the Ottoman period and the Great Serb migrations from medieval Serbia, "Rácz" has survived as a common surname in Hungary.
4) Lechites (Lechici), derives from the name of a semi-legendary ruler of Polans, Lech I.