It is fairly common practice for family researchers to view records and extract information for not only their known family members but also "same surnamed" individuals that they haven't had the time yet to sort through. These lists are shared on the web in the hope that someone else might benefit from them and that someone will connect to their family. Some of these lists are fairly extensive and might give the impression that someone took the time to index a complete volume of records. Be sure to read the description of the list.
I am very happy that the LDS has been putting images of records online. For example, images of catholic parish records for the Archdiocese of Chicago are online. But, I don't like their cataloging of the online material. Most of these were originally on microfilm and were scanned to create digital images.
According to a St. Teresa Church parish history, the parish was founded by ten Polish families who were dissatisfied with the land in Marche, Arkansas where they had originally settled. They participated in the land rush of 1891 to secure new homesteads. While numerous sources repeat the same information, none list the family names or can confirm they were all from Marche, AR. In comparing the 1880 US Census records for Marche against headstone inscriptions in the St. Teresa Cemetery in Harrah, OK, it appears that the Blochowiak, Chicoraske, Jorski, and Malaske families were from Marche.
Surprisingly, there was a Polish community in Pulaski County, Arkansas. It's founder was Timothy Choiński who came to the US in 1873. Initially settling in Milwaukee, he thought that Poles might want to get back to their farming roots away from the urban scene. Furthermore, he wanted a site where the winters would not be so harsh. He started his settlement, Marche (French for marketplace), in 1877 in section 26 of what was to become Worthen Township. It was Pyeatt Township at the time. Like some other Polish farming settlements, there were complaints about the land not being cleared or being of poor quality for farming.
Regardless of one's best efforts, errors in indexing are inevitable. As mentioned in another article, reading bad handwriting is probably the biggest source of errors. Then there are also data entry errors (typos) of the indexer and errors in fact created at the time the record was originally written. Many indexes in genealogy-land are regarded as transcripts-- faithful and accurate copies of the original records.