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Javascript split slice join string

I am struggling a bit with this problem.

I have a string "Jan van Wyk". "Jan" is the firstname and "van Wyk" is the lastname.

let enqBy = "Jan van Wyk";
var firstName = enqBy.split(' ').slice(0, -1).join(' ');
var lastName = enqBy.split(' ').slice(-1).join(' ');
console.log(firstName);
console.log(lastName);

Using this code the result is firstname = "Jan van" and lastname = "Wyk" which is not what I want.

If I have a string like "Elvis Presly" the code works perfectly firstname = "Elvis" and lastname = "Presley".

Please guide me.

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