We are into the realms of supposition rather than factual recording for the records for Zsigmond predate National Registration.
Two burials only a short distance from each other seem to SUGGEST that Zsigmond was buried as a Fischer, whist his wife was buried much later as a Foti.
Fóti Zsigmondné Netter Eugenia ? 1920 Salgótarjáni út J 11 15
and only a few graves away is
Fischer Zsigmond ? 1886 Salgótarjáni út J 11 8
Of course this could be coincidental, BUT that particular cemetery had been closed for over 20 years, so Eugenia must have made a special request to be buried close to someone that we strongly suspect was her husband.
Roy