Ronaldo's full name is Cristiano Ronaldo dos Santos Aveiro. Of these, "Cristiano" is his first name, "Ronaldo" is his middle name, "dos Santos" is his surname, and "Aveiro" is his place of birth. The name printed on the back of the jersey is too long, and because Ronaldo at that time only belonged to Brazil No. 9, according to the Western abbreviation custom, C.ronaldo was printed, and "C" was his abbreviation, which was abbreviated by the first letter "C" in his name. Therefore, Ronaldo is called Ronaldo because the first letter in his name is "C" and is used as his abbreviation. Therefore, the domestic abbreviation is Cristiano Ronaldo.
