Female last names in Czech Republic ending in OVA?

An acquaintance of mine is from the Czech Republic. I noticed when looking through her facebook pictures that her and all of her female friends have last names that end in "ova" for example, her last name is Hadrova. Again, I was watching ghost hunters and they were in a castle in Czech Republic and the... show more An acquaintance of mine is from the Czech Republic. I noticed when looking through her facebook pictures that her and all of her female friends have last names that end in "ova" for example, her last name is Hadrova. Again, I was watching ghost hunters and they were in a castle in Czech Republic and the two women that spoke had last names that ended in "...ova." I have noticed however, that the males do not have these same last name endings.
I was just curious, is this all a coincidence or is there an actual cultural explaination as to why the females have last names with this ending and males to do not?
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