I think both romanians and hungarians has a strong slavic ancestry. My personal evidences: At First:
I searched for all my 8 great-great-grandfathers direct paternal line male descendants, (and two other of my great-great-great grandfathers male descendants) and managed to identify their exact Y haplogroup.
I think, the results are interesting.
1.) E1b1b-V13-CTS9320-Y81971. family name: Küzmös, earliest known ancestor born: 1735 Penészlek, Szatmár county, religion: greek catholic, origin: unknown, maybe illyrian, thracian or dacian?.
2.) R1b-U106-DF98-S22069. f.n: Dobi, e.k.a: 1758 Balkány, Szabolcs, county. r: reformed protestant, o: germanic.
3.) R1b-U152-L2-Z49-S8172 f. n: Béres, e.k.a: 1831 Nyírbéltek, Szabolcs county, r: greek catholic, o: Hallstatt celtic
4.) I2a-L621-A1328 f.n: Tóth, e.k.a: 1809 Nyírbéltek, Szabolcs county, greek catholic o: proto-slavic, rusin
5.) R1a-M458-YP415 f.n: Kalenyák, e.k.a: 1813 Felsőszvidnik, Sáros county (today Slovakia) greek catholic, o: western slavic, polish
6.) R1a-L664-S2866 f.n: Simon, e.k.a: 1758 Rimaszombat, Gömör county (today: Slovakia) reformed, o: western germanic, maybe langobard
7.) I2a-L621-Y3118 f.n: Kiss, e.k.a: 1783 Penészlek, Szatmár county, greek catholic, proto-slavic, rusin
8.) I1-L22-FGC14412 f.n: Szilágyi e.k.a: 1795 Penészlek, Szatmár county, greek catholic, o: proto-germanic, scandinavian, varangian from Kiew Rus?
9.) R1a-CTS1211-Y33-YP1701 f.n: Petruska e.k.a: 1781 Nyíradony Szabolcs county, roman catholic o: eastern slavic, slovakian or rusin
10.) Q-L53-L330-YP1695 f.n: Csehely, e.k.a: 1798, Bánháza, Szabolcs county, greek catholic, o: Cuman or jasz, according to Maciamo: Hunnic from Inner Asian steppes.
So it means, I haven't finno-ugric, central asian turkish or scythian, other iranian ancestry of these 10 ancestors.
But I have
30% indigenous proto-european mesolithic hunter, (I1, I2).
10 % neolithic farmer (or mesolithic hunter?) from Africa (later the Mediterraneum, E1b1b); 50% Bronz Age invaders from the Pontic-Caspian steppe, Indo-europeans, (R1a, R1b)
10% Inner Asian (Hunnic?) invaders from the Mongolian steppes, (Q)
From another point of view:
40% slavic
30% germanic
10% celtic
10% illyrian/thracian/dacian
10% hunnic-inner asian.
At second:
I searched my closest relative families all of this, and my two I2a-L621 results, based on the YFULL, and FtDNA:
I2a-L621-S17250-A1328 known families: (TMRCA: 1400 ybp)
Sergeyev: Tula, Russia
Prudkyi: Harkov Ukraina
Rudy: Lipivci, Ukraina
Barbo: Talachin, Belarus
Vlarenic-Stachowski: Stochava, Belarus
Dzuba: Botajnica, Bosnia
Ciric: Maricka, Bosnia
Vranjesevic: Bosanski Petrovac, Bosnia
Wisniewski: Warsawa, Poland
Starasinic: Krasinec, Slovenia
Melnikov, Baskiria, Russia
Tóth: Nyírbéltek, Hungary
I2a-L621-Y4460-Y3106-Y3118 known families (TMRCA 2200 ybp)
Vorobyev: Jaroslavl, Russia
Lepeshov: Sloboda, Russia
Karandin: Tver, Russia
Mayorov: Iskozy Belarus
Rogozin: Suhumnichi Russia
Guzev: Voronez, Russia
Akenfelds: Nikrace, Latvia
Leszcyszyn: Odrzechowa, Poland
Bogdanec: Mcensk, Russia
Led: Sagun, Russia
Yagovtsev: Krasnodar, Russia
Vlasov: ? Russia
Mazalov: Sovetskaya, Russia
Voronin: Moscow Russia
Sari: ?
Lavrov: ?
Chebotar: ?
Litowczak: Smerek, Poland
Dorogov: ?
Yurkovets: ?
Czerniechowski: Poland
Pererva: Kazatskoye, Ukraina
Borgelin: Terralampi Vihti, Finland
N.N: Viljandi, Estland
N.N. Ahtirsky, Ukraina
N.N: Iasi, Romania
N.N. Istanbul, Turkey.
According this, I think, both of my two I2a-L621 roots are clearly slavic. There are no west european or germanic results.