First/Middle name?

Samantha ⚓️
My girlfriend and I came up with the name Railynn. It's a mixture of our middle names (Lorraine and Lynn). One thing we don't know yet is if we will use it for her first or middle name. If we decide to use it for the first name, we are unsure what to use for a middle name and vice verse. Opinions? :)  also still unsure if we will hyphenate our last names or not.  My last name is Anderson and my girlfriends name is Plank. Just throw things out there :) thanks!! 
_____ Railynn 
Railynn _____