The material comes from metrical records located in the Sosnowiec Diocesan Archive in Sosnowiec. In this article the development of the naming system in Poland is presented, as well as an analysis of the history of St. Andrew the Apostle Parish in Olkusz and an analysis of the sources. The main purpose of this work was to show the frequency of names that were given in baptism to the children of the parish in Olkusz during the 18th-19th centuries. In the final part of the article, a comparison is made between the names appearing during the 18th-19th centuries with those given children during the years 1985-1990. The difference is presented in the frequency distribution as well as in the motives for giving children these names.