What does the boy’s name Yang Yang mean?

Perfect is a good name

Yang: numerous; vast, grand; formerly refers to the center of the sea. Also refers to the sea area in general.

"Shuowen Jiezi" explains: water. It leaves Qi Linqu Mountain and enters Juding in the northeast. From the sound of water sheep.

Overflow: It means overflowing, overflowing.

"Shuowen Jiezi" explains: The vessel is full. From the sound of water.

Yang means vast, magenta, and vast; Yi means exceeding, exceeding, and overflowing, which has a beautiful meaning.

Meaning: The name can be interpreted as: "a fertile land filled with flowers, sunshine, and delicious food."