There is no saint named Columbus.
Christoper Columbus is not a saint. St. Christopher, by legend, carried a child across a river. The child later revealed himself as Christ. In that way, St. Christopher became the patron saint of travelers. The real St. Christopher may have lived during the 4th century, B.C.
The patron saint of sports (athletics) is St. Sebastian, not St. Chloe.
There is no saint named Paricia.
St. Petersburg is the name of a city and not a saint.
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There is a St. John the Baptist but no St. John Paul the Baptist.
Andrew is a saint but not a patron saint.
1921
There seems to be no Saint Cadog, however there is Saint Cadoc of Llancarvan. Is this who you were referring to?
Pius XI is not yet a canonized saint.
St. Patrick did not aspire to become a saint. He simply tried to do the will of God in the best way possible and that led to him being declared a saint.
There were a couple St. Oswalds, you need to be more specific.