Simplify the following text for a Grade 6 native English-speaking person.
Original: The name is thought to derive from a Kyrgyz word for a churn used to make fermented mare 's milk ( kumis ) , the Kyrgyz national drink .
Simplified: In Kyrgyz , a Bishkek is a churn used to make stirred horse milk ( kumis ) , the Kyrgyz national drink .