Don't know

I'm currently on my 4th baby,  but I get so frustrated with names, my first girl name is Katherine Michelle, my second girl name is Evolet Victoria, and my son name is Joseph Noah, so I LOVE Jade if I have a girl but if I have a boy I LOVE Nathaniel and I'm not sure just to give one name to my next baby or middle name also so I don't know what to do! Any suggestions oh their last name is Martinez (such a common last name)