I'm looking for the original spelling of my great-grandfather-in-law's family name. His name was George Olasin, but it was changed when he came over from Hungary. I'm beginning to think it might not even be too close...

I've managed to find his SSN and death certificate, but I'm wondering where to go now. I thought his naturalization records might have more info? Or would his social security file have anything? Any suggestions on how to obtain either one?

Thanks!