Wikipedia writes that according to research published in 2004 likely belonged to Y-DNA Haplogroup E1b1b1 (E-M35), a haplogroup which originated in East Africa. It adds: "In 2010, journalist Jean-Paul Mulders and historian Marc Vermeeren publicized analysis of samples taken from 39 patrilineal relatives of Hitler, supporting the above finding and pointing out that Haplopgroup E1b1b was now common among Berbers, Somalis and Jews.
The Wikipedia article points out that it would be false to conclude from this that Hitler had Jewish ancestry. "Family Tree DNA records showed that at least 9% of the populations of Germany and Austria belonged to Haplogroup E1b1b, and about 80% of that group had no Jewish ancestry. 'This data clearly show that just because one person belongs to the branch of the Y-chromosome referred to as haplogroup E1b1b, that does not mean the person is likely to be of Jewish ancestry,' said Professor Hammer."
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