I think it would be worth explaining the rationale of this helper here — maybe giving a few examples of “guesses” would help?
```javascript
/**
 * Parses a name string to guess a givenName and a familyName, e.g.:
 *   'Jose Cantera' -> 'Jose', 'Cantera'
 *   'Jose Manuel Cantera' -> 'Jose Manuel', 'Cantera'
 *   'Gunilla von Bismarck' -> 'Gunilla', 'von Bismarck'
 */
```