What is the place of birth for these ancestors?
RODAK surname shows up in Slovak Republic but I think your research will be in Poland. This from looking in Ellis Island site for MARFICA and CHIOCHON.
Few good sites for research.http://maxpages.com/polandwww.rootsweb.com/~polwgw/index.htmlwww.halgal.comwww.surnamenavigator.org
Distribution of RODAK:http://www.moikrewni.pl/mapa/kompletny/rodak.html
No MARFICA but similar sounding name MARCHWICA, MAREKWICA, MARKWICA and MARLICA in Poland. To hear pronounciationhttp://say.expressivo.com