Y chromosome DNA haplogroup J2a
Derived J M304, J2 M172, J2a M410 positive
Ancestral J1 M267, J2a1a M47, J2a1b M67, J2a1e M158, J2a2 M340 negative

Cook Genealogy DNA List (Group 23 is my genetic match)

Haplogroup J2a, defined by M410, was not common in premodern England, they were in northern Europe in small numbers. There's no reason to think J2 wasn't there thousands of years before the Romans landed, could have traveled with Neolithic people who brought advanced society to the occupied islands, the gene still isn't common there. J2 (living among other Y chromosome variants) could have originated along a freshwater or brackish Black Sea over 10,000 years ago.

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