PersonNameComponentsFormatter.swift

import Foundation 

let formatter = PersonNameComponentsFormatter()
formatter.style = .long

do {
	let components = formatter.personNameComponents(from: "Marcin Krzyżanowski")!
	print(components.givenName!) // Marcin
	print(components.familyName!) // Krzyżanowski
}

do {
	let components = formatter.personNameComponents(from: "Krzyżanowski Marcin")!
	print(components.givenName!) // Marcin
	print(components.familyName!) // Krzyżanowski
}

do {
	var components = PersonNameComponents()
	components.givenName = "Marcin"
	components.middleName = "the Great"
	components.familyName = "Krzyżanowski"
	let name = formatter.string(from: components)
	print(name) // Marcin the Great Krzyżanowski
}

Interesting what it gets right and what it doesn't.

do {
	let components = formatter.personNameComponents(from: "Jones Smith")!
	print(components.givenName!)
	print(components.familyName!)
}

do {
	let components = formatter.personNameComponents(from: "Smith Jones")!
	print(components.givenName!)
	print(components.familyName!)
}

//Jones
//Smith
//Smith
//Jones


do {
	let components = formatter.personNameComponents(from: "Joe Smith")!
	print(components.givenName!)
	print(components.familyName!)
}

do {
	let components = formatter.personNameComponents(from: "Smith Joe")!
	print(components.givenName!)
	print(components.familyName!)
}

//Joe
//Smith
//Joe
//Smith