free today (but attending some birthday later) and since I mentioned it, here is
only short paragraph from otherwise long works by modern German scientists from Jena, town... only about language, not about tribes but interesting in our tribal way:
Elsewhere in Iranian, however, the evidence points to a development *sr > hr inall contexts rather than *sr > *θr, and thus we can easily assume that *tansra-yielded tanhra- > *tãhra- > *tahra- which then developed quite parallel to *hazah-ra- ‘thousand’ > MP, Parthian hz’r, Sogd. z’r, Khot. ysāru etc. For initial position,compare the following cases: 1)*srautah- > *hrautah- > OP rauta ‘river’ > MP, Parth. rwd, Sogd. rwt, NP rōd. 2)*sraxwa- > *hraxwa- ‘corner of mouth?’ (= OIA srákva-) > Armenian LW erax‘mouth’, Persian rox, Pashto rāx/-rxo ‘cheek’, Bal. rakk ‘lip’ (cf. pakkag ‘ripe’ <*paxwaka). 3)*sraba- > *hraba- > Pashto raw-, Shughni rāv- ‘to suck’ ... < IE *srebʰ- ‘to sip,to slurp’
not expert on issue and many things are above my knowledge, but super interesting theories... we are talking "lingustical events" dating to some periods centuries BC in general. Might be true and Serbs and Croats might be living example in today world of such hypothesis (as tribe names)... interestingly enough one unrelated work by "Czech or Saxon Serb" scientist from days when sceince wasn't as advanced and not knowing all this about Iranic languages (some XIX or early XX c, I forgot and not important to check now) proposed that Serb derive name from some (he imagined it as Slavic word) "to sip or to suck, slurp etc." - funny enough it is mentioned in some form in this work... However, most likely Serb(v)s and Cr(v)oats do not have Slavic word in basis of tribe name, but proto-Indo-Iranian-European related to "serve, protect", my and some others proposition based on Serb migrations and being often in service of others, confirmed by geographical mentioning and positions through centuries (already talked about...) It is not exact science, just propositions with very reliable percent of chance which objective people in range from England to Germany and Russia alike mentioned in their works, making our ancestors "super cool"
considering exact science, modern DNA researches were helpful for us combined with old theories show that there is something unusual in our tribes, but didn't change anything about Serbo-Croat being properly classified as Slavic, what it is... genetically we are (as Bulgarians) not so Slavic, but it doesn't change our ties with Russia/Turkey/Sweden etc. and science is not political tool. so yes, linguistically we are "Slavic" as well as Hungarians today are "Uralic" (or whatever their scientist classify their language as...) but we both are not genetically either of that in most part of today population
in short - we are of Scythian/Iranic origin (not to be mixed with Persia with whome we had wars)), to many foreigners we are looking like Turks, with more Albano-Greek genetic material today than Polish-Slavic, but very Slavic and "brothers of Russians", "Swedish lost relatives" ........ makes sense

some science should be approached with open mind and accepted. Ready to say - while many do not understand - that we (and Croats) have the most proof (except some Caucasian, Iranian, Anatolian etc. tribes) by sources of all European nations to accept at least part of Iranic ancestry....
regarding Turkey and Turks - it is cultural (in some percent genetical too) thing and obviously, despite historical wars, one do not mimic those they hate passionately

(as we mimic-ed Turks in some language forms, dishes and musical expressions...) Finally - talked with some males I know and generally Serbs do have sexual attraction to Turk females, Arabic, Iranian and their "moves" (even if not talked openly), which is good thing for future....