I'm not a paid Ancestry subscriber so can only give you information that I find for free.
At the time of your ancestors birth it was http://brainworker.ch/Oesterreich/Austria-hungary.png
Birds of a feather fly together - common language and common tradition to observe. Were the children naturalized with their parents or by themselves? http://www.kdejsme.cz/prijmeni/Kojet%C3%ADnsk%C3%A1/hustota/
You have a precise date of the ancestors arrival to America so you have the arrival manifest?