Here's why:
* French names are often different from English names. There's no equivalent French name that sounds like "Kendrick".
* "Kendrick" itself is not a common French name. It's an English name of Scottish origin.
If you need to write "Kendrick" in a French context, you would simply use the English spelling.
For example, you could write "Kendrick Lamar" in French as "Kendrick Lamar".