Im might seem strange but go ahead and still nameur child. You could even have a ceremony it might offer clisureclosure
I'm sorry you went through a miscarriage, I had 2 in 2014; one at 5wks 2nd at 4wks and the only thing I can tell you it's to not try and understand why it happened. I kept blaming myself for the first one then I got pregnant again in November only to miscarry 3 days later and when I had given up all hope on December 34rd I found out I was pregnant for a third time, I am currently 38 weeks along with a baby boy :)
I had a stillborn at 8 months in 2013, so I know what losing a baby feels like. In her memory I got a half sleeve tattoo and my husband got his side done. You could always plant a flower or a tree or something along those lines.