Others, like Oleg Trubachyov were talking about the indo-arian origins of sindhs, but today this opinion is rejected by the majority of scholars.

Modern historians and archeologists like Andrei Michailovich Novichihin believe Sindi were of a mixed origins, some of them were indo-iranian, others caucasian (proto-circassian).

[4] Unlike the majority of the Sindi, who remained in the northern Caucasus, a smaller section of the Sindi migrated westwards and settled into the Hungarian Plain as part of the expansion of the Scythian into Central Europe during the 7th to 6th centuries BC, and they soon lost contact with the Scythians who remained in the Pontic Steppe.

The 3rd century BC Greek author Apollonius of Rhodes located a population of the Sindi living alongside the Sigynnae and the otherwise unknown Grauci in the "plain of Laurion", which is likely the eastern part of the Pannonian Basin.

[4] The Hungarian Sindi had almost equal proportions of Neolithic origin and steppe, associated with the Yamnaya culture; there is also a minor contribution of WHG.