Here are some options depending on the context:
Formal:
* Кевин (Kevin) - This is the most common way to transliterate the name.
* Кэвин (Kevin) - This is a more phonetic transliteration.
Informal:
* Кеша (Kesha) - This is a common nickname for Kevin.
* Кирилл (Kirill) - This is a Russian name that sounds similar to Kevin and can be used as a substitute in informal settings.
Ultimately, the best way to say "Kevin" in Russian depends on the situation and your relationship with the person.