Was your ancestor alive for 1930 census?If yes, does it say Na-naturalized, Pa-first paper or Al-alien?If not naturalized and lived pass 1940 than an Alien Registration Form to locate.Were you successful in locating his draft registration form? What time frame did he come to America? Jan in Slovak and Janos in Hungarian. http://www.polishroots.org/surnames/surnames_endings.htmhttp://www.polishroots.org/surnames/surnames_endings.htm www.helenezx.homestead.comlook for OLSAVSKY in Slovak Pride Index www.pavlovics.comI can recommend his services www.slovakfolkcrafts.com www.slovakinstitute.com www.iarelative.com www.cgsi.org www.ncsml.org http://slovakia.eunet.skhttp://slovakia.eunet.sk OLS^AVSKY - SKY male ending and OLS^AVSKA - SKA a female ending does list in SK's phone book.www.zoznamst.sk In Slovak Republic a village Nizna Olsava and Vysna Olsava.www.obce.infoBeside those 2 villages that is Olsavce, Olsavica, Olsavka (2), Olsov and Olsovany. The ending SKY on the end of a surname suggests that the surname originates from a village by that name. Take a look at Janos OLSZAWKY; Georg and Ference(Ferencz) OLSZAWSKI; Janos OLSZAWSKI; Karoly OTSZAWSKY;in www.ellisislandrecords.org You need to register to EI site but no money.