The feasts of the following saints are celebrated on September 21:
Alexander of the Via Claudia
François Jaccard
Gerulph
Hieu
Imbert
Iphigenia
Isaac of Cyprus
Johannes Ri
Landelin of Ettenheimmunster
Mark Scalabrini
Matthew the Apostle
Maura of Troyes
Meletius of Cyprus
Michael of Tsjernigov
Pamphilus of Rome
Theodore of Tsjernigov
Thomas Dien
St. Matthew the Apostle is the patron saint of September 21. He was one of the twelve apostles of Jesus and is known for authoring the Gospel of Matthew.
Saint Michael the Archangel (feast September 29) was and continues to be the patron saint of Normandy.
St. Michael the Archangel is a patron saint of grocers.
I can find no reference to a St. Colin. However, there was a Saint Collen whose feast day is May 21. He is not a patron saint.
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.
The feast of Maria dAlemanna on September 8.
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.