The name Kein appears to have seen its peak popularity in recent years, with the highest number of births occurring in the past decade. Since 2007, there have been at least six births every year up until 2014, with a slight dip to five births in 2015 and 2019 before rising back up to six births in 2023. The overall trend suggests that the name Kein has maintained a consistent level of popularity over time, with a total of ninety-five births recorded between 1984 and 2023.