Is there any connection between Ronaldinho and Ronaldo in Portuguese?

C Ronaldo, Portuguese is Ronaldo; Ronaldinho, Portuguese is Ronaldinho.

In Portuguese, a noun or adjective is deformed into -inho or -inha at the end, which has several meanings: 1, indicating the degree, such as "clean", and using this deformation means "really clean"; 2, cute, such as "beautiful"; 3. The most commonly used means "small", such as "girl" and "little girl".

For your question, explanation is the third kind.