Kelvan is likely a modern form influenced by Kelvin, a Scottish river and place name.
Kelvan is likely a modern form influenced by Kelvin, itself a Scottish river and place name. That kind of place-based origin gives the name a grounded, geographic feeling, even when the modern form has been adjusted for style and flow.
Kelvan sounds compact, masculine, and contemporary. It has the calmness of a surname-like name and the quiet stability of a place name, but without feeling overly formal. The name is distinctive without being difficult, which is part of its appeal. Kelvan feels clean, modern, and slightly understated.