Counting the given personal names only, so excluding the family names (last names/surnames), patronymics or anything else of that sort.
Different cultures have different naming customs and for example as a child while learning English I was a bit confused by the "first/middle/last name" nomenclature because we often list them in a different order and do not have "middle" names.
And please specify your culture, especially if it isn't the majority one for your country.
Thank you in advance!