ABSTRACT Kurds are traditionally regarded as Iranians and of Iranian origin, and therefore as Indo-Europeans, mainly, because they speak Iranian. This hypothesis is largely based on linguistic considerations and was predominantly developed by linguists. In contrast to such believes, newest DNA-research of advanced Human Anthropology indicates, that in earliest traceable origins, forefathers of Kurds were obviously descendants of indigenous (first) Neolithic Northern Fertile Crescent aborigines, geographically mainly from outside and northwest of what is Iran of today in Near East and Eurasia. Oldest ancestral forefathers of Kurds were millennia later linguistically Iranianized in several waves by militarily organized elites of (R1a1) immigrants from Central Asia. These new findings lead to the understanding, that neither were aborigine Northern Fertile Crescent Eurasian Kurds and ancient Old-Iranian speaker (R1a1) immigrants from Asia one and the same people, nor represent the later, R1a1 dominated migrating early Old-Iranian-speaker elites from Asia, oldest traceable ancestors of Kurds. Rather, constitute both historically completely different populations and layers of Kurdish forefathers, each with own distinct genetic, ethnical, linguistic and cultural backgrounds. These new insights indicate first inter-disciplinary findings in co-op- eration with two international leading experts in their disciplines, Iranologist Gernot L. Windfuhr, Ann Arbor, and DNA Genealogist Anatole A. Klyosov, Boston, USA.