The boy’s last name is Yan with the word “Hai” in the middle.

Possible name: Yan Haishan (Sea Mountain, describing vast, tolerant, stable, broad.)

Yan Haiyan (Haiyan, taken from "He Qing Hai Yan", meaning the Yellow River The water is gone, and the sea is calm. It is a metaphor for peace in the world.)

Yan Haibei (sea shell, meaning a shellfish in the sea.)

Yan Haitang (begonia, meaning fallen leaf) Small tree. )

For reference.