Russian has NO sound "H" or Hebrew ה and NO letter for it.
in foreign words Rissian changes it to G (Г) like in Gematoma, Gemoglobin.
Sometimes it dissapears (as in hystory - История)
in belarussian language Г sounds as fricative sound so it is closer to h and, may be, it is easyer to sign english h or hebrew-yiddish ה (as in הערץ) by belarussian Г.
practically, if you know him as Herts (hart in Yiddish), call him Herts.