It is my understanding that the surname HREHA is the Rusyn form of GREGA, a
shortened form of the name GREGORY. The following is a site regarding LEMKO
surnames that you may find helpful for illustrative purposes.
It is also my understanding that the hard "G" and hard "H" have sometimes
been interchanged, such as the name HRHOV (as in SPISSKE HRHOV) for GORGO (the
Hungarian name for the village). I hope this helps. My knowledge of the
Rusyn language and culture is very limited. I hope this helps a little.
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