Surname: Altdorf | Name index 8 people Guelfe (Welf), count of Altdorf Jean Altdorf * 1805 N von Altdorf Raul, count of Ponthieu und Troyes Rudolf I, count of Ponthieu Warin von Altdorf Welf II de Altdorf, count in Lechrain Welf III. duke of Kärnten * 1016 Surname