Simatoc was born to Romanian parents in Grimăncăuți, present-day Moldova. He was raised Romanian Orthodox by his family. He was also known as Miklós Szegedi while playing in Hungary. Simatoc was married to a Hungarian woman named Etelka Stolárcsik, with whom he had two sons. One of them, Silvio, born in 1950, had followed his father's footsteps and played in lower leagues in Spain and Australia.[7]