That is very much NOT a ridiculous question!
I didn't realize that at all until I found my grandmother's 2nd return trip years ago to the US and she was listed with the -ova ending. Never came up when talking with my Mom about the language.
Short answer to it: yes.
Here's a some useful reference:http://en.wikipedia.org/wiki/Czech_name#Female_surnames
Also - see page 12 on this reference PDF:https://www.fbiic.gov/public/2008/nov/Naming_practice_guide_...