Carson

The meaning is not uncertain. It is a originated from a surname, and as for the meaning, it means “Son of Car”, just like Madison, Addison, Emerson, Mason, Jason, Grayson, Lawson, Harrison, Morrison, but Allison is an exception, since it wasn’t originated from a surname and does not mean “Son of Alice” and Allison is a feminine name. Carson is a masculine name derived from a surname meaning “Son of Car”. Carson can be used as a male's name or a females name, but usually used more as a masculine name.

I have read that it means "dweller by the marsh". I have dwelt by a couple of marshes at times. It is more pleasant than one might think because of the abundance of wildlife.
---"Kit" Carson.