For Sobotta there are 175 on Yasni with different names.
Among the most common last names on Yasni Sobotta is on position 4352.
"Sobota" is Polish for Saturday. The name can be found in the Czech Republic again often in modified form. Zb Swoboda, Sobotka, Sobotta, etc. I think that the name comes from the origin of the Polish and Saturday means.
(Sent from: Werner Sobotta)