Boy name opinions and need ideas for a girl.

We are currently pregnant with our rainbow baby after our firstborn son died at 36 weeks gestation. If this is a boy, we'd like to have some sort of semblance. Robert is a family name, with all males going by their middle name.

Our son that passed is named Robert Fenix.

Our idea for a son would be Robert Griffin.

Yay/nay/opinions?

We'd also like opinions for a girl name. I do like nature names but open to suggestions. My first thought was Brena Wren.