reading info in birth certificate #poland #names

Liliana Weintraub

My father was  born in 1905 in Borszczow, and his brother and sister in Mielnica. On checking their birth certificate I can read their father´s name as Jakiw Nachman Hepilbaum F. Weintraub (in my father´s certificate) and Jacob Nachman Epfellbaum R. Weintraub (in my aunt and uncle´s certificate). I understand the change in the spelling of the surname, but what do the letters F  and R -  between both surnames - stand for?  Can anybody help me?

Thanks in advance

Liliana Weintraub - Argentina

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