You need to specify these 'certain people' as each saint has specific reasons for being canonized.
Canonized
St Martha was never formally canonized by the Catholic Church. She is recognized as a saint based on tradition and popular veneration.
Patron saints are specifically designated as protectors or guardians of certain groups of people or places, while Catholic saints are individuals who have been recognized by the Catholic Church for living holy lives. Catholic saints may be invoked as intercessors in prayer, but patron saints have a specific focus based on their designated patronage.
There have been about 80 popes who are considered as saints. Some of these were declared saints in the early Church before the canonization process existed. Others are in various stages of canonization. See the complete list of popes and you will find all the popes who are saints, canonized saints and candidates for sainthood.
Answer: Although no official list of canonized saints in the Catholic Church exists, it would be safe to assume that there are roughly 10,000 officially canonized saints. Because of the nature of canonization, which includes rigorous investigation into the deceased's life and the evidence needed for two miracles, it would not be wrong to say that the 10,000 number is on the low side of the actual amount.
Pope John Paul II canonized about 480 saints.
He beatified 1,340 people and canonized 483 saints.
There is no canonized saint named Darren in the Catholic Church. Saints in the Catholic Church are individuals who have been officially recognized for their holiness, virtue, and miracles.
The term saint refers to New Testament individuals. I can find no saints who entered heaven after the death of Our Lord named Joshua. There may be many such saints with that name who are known only to God. We do not usually refer to holy people from the Old Testament as saints, although they may be in Heaven.
There have been over 70 popes canonized as saints, not just three.
There are at least 3 saints named Thecla. All were early martyrs who were never canonized because the process was not in place at the time. They were declared as saints by the early Christian community based on their martyrdom. The Orthodox Church did not exist at the time so they would have been recognized by the early Catholics. After the Orthodox Church split from from the Catholics, they continued to honor these early saints.
Godric was one of the last saints to be informally canonized by local church officials before the formal process was in full force. Under the new procedure, only the pope can declare saints, removing that prerogative from local bishops