How to access xAPI/Tin Can LMS variables in JavaScript

here is a script to split the fname (multiple words) and lname (last single word)

var name = "Max Maria Franz Müller-Lüdenscheidt"

var tmp = name.trim().split(" ")
var lname = tmp.pop()
var fName = tmp.join(" ")

console.log("fname:", fName, "- lname:", lname );

you can test such javascript snippets here

https://www.programiz.com/javascript/online-compiler/