English surname used as a given name, from Old English Clerc meaning scribe or scholar (later clerk); the Superman connection through Clark Kent gives it a quietly heroic quality.
Nicknames
clarkie
Vibe
strong
How it ages.
Clean and strong; the superhero association is subtle enough to be appealing rather than costume-y.
The cultural moment.
Rising in the US and Australia since 2015 as part of the occupational surname trend.