Elijah is a prophet from the Old Testament. The title of saint is usually reserved for those entering Heaven after the death of Our Lord - New Testament. Elijah is most likely in Heaven but was never officially declared a saint.
The patron saint of sports (athletics) is St. Sebastian, not St. Chloe.
There is no saint named Columbus.
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
Elijah is considered a saint in various Christian traditions based on his role as a prophet in the Bible, particularly in the Old Testament. His holiness and closeness to God, as depicted in the biblical narratives, have contributed to his veneration as a saint. The process of officially recognizing him as a saint involved his acclaim as a saint in the early Christian Church and subsequent liturgical veneration.
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.