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There is no saint officially recognized by the Catholic Church named Sidney. The name Sidney is of English origin and typically associated with individuals rather than saints.
I can find no canonized saint named Sydney. However, I did find Blessed Sidney Hodgson. He was a convert to Catholicism and martyred for assisting priests during a period of English history when Catholicism was outlawed. He has been beatified and is not yet a saint so has no patronages assigned to him at this time.
The Patron Saint Inex lists no patron saints of bears.
The Patron Saint Index lists no patron saint of dinosaurs.
A patron saint is supposed to be a protector in the Catholic religion. Patron Saint Angelico is the patron saint of artists. A patron saint is a protector of life.
As per the Patron Saint Index, there is no patron saint of wrestlers. However, Saint Sebastian is the patron saint of all athletics and athletes.
Saint Lillian is not a patron saint as per the Patron Saint Index.
No, there is no patron saint of billiards.
There is a patron saint of Wales but no patron saint of whales.
There is no patron saint of color.
There is no patron saint of voting.
There is no patron saint of red heads as per the Patron Saint Index.