Question

Why did ranga and ratna kept their child name as 'shyama'?

Answer 1

because both ranga and ratna admired the narrator behind their meeting and marriage . so to give a tribute to the narrator they named their son shyama after the narrator's name.
hope my answer will be helpful for all of uuuu.........

Answer 2

The reason that Ranga and Ratna kept their child name as Shyama was because it was only due to Shyama that Ranga could marry Ratna.

Shyama was the person who changed his thoughts towards the concept of marriage and did everything to bring the pair together and make the marriage happen.