My mother died on the eighth day of the eighth lunar month, and my son is about to be born. I want to give my son a name in memory of my mother.

It better be your mother's name. I remember watching "Little Fish and Hua Wuque", Hua Wuque named the child Yu Nian in order to make himself and his children remember the little fish. You can also do this well, that is, you miss someone.