The horse name.

I do not know the linguistic reason, but many Czech surnames go without endings (s, -ev,...).
For example, in Russia you will often meet "Baranov", while the "parent" from the Czech Republic will have the surname simply "Baran" (Beran).

There is a friend from the Czech Republic with the name "Kozel". He told the story:

They were flying some company to the sea on vacation.
Waiting for the flight is boring - the only pleasure: bar and drinks for 18+.
It should be noted that there were a couple of other people in their company.
The animal names.

In the bar it became fun - for the time no one is watching :-) Suddenly they hear the speaker, pressed by laughter, transmitting to the entire airport: Kozel,
Suslic and Yizik go to the departure zone immediately!