Fictional name invented by Clive Staples ("Jack") Lewis for one of the main characters (a prince, and later king) in The Chronicles of Narnia, a series of seven fantasy novels for children
The name is probably based on the name of the Caspian Sea, the great saltwater lake between Russia and Iran, which takes its name from the people known to the Romans as the Caspii, who lived on its shores and who originated from a region of the Caucasus. Their name may mean 'white', but an association with the biblical name Cush (Ethiopian word meaning 'dark-faced, swarthy') is also possible 
See also -ian.
|Female ♀||Male ♂|
|#: count of main first name only|
|&: count of both main and additional first names|
| Name counts are approximate as statistics normally is not published
for names given to less than 3 or 5 persons per country.