For Würtz Knudsen there are 7 on Yasni with different names.
Among the most common last names on Yasni Würtz Knudsen is on position 4520.
Source is root.
(Sent from: Gabriele Würtz)
To my knowledge, the name is derived by Knutson, as there was in earlier times, no last name. It means the name of the son of Knut.