Sammy... Anyone who knew me before I moved to Louisiana still calls me this.
Sam... I was called that In the 6th grade when I mived to Louisiana and it just kinda stuck.
Sammie... a different spelling of the name before because it was different people and thats the way they spell it.
SamWise... some friends and I became obsessed with Lord of the Rings... the name speaks for itself.
My favorite is Sam, plain, but its what everyone calls me.