Slender or fair
Cailan is a modern phonetic variant of the Irish name CaolΓ‘n. It is derived from the Gaelic word 'caol', which translates to slender or narrow, often used to describe a lithe or graceful person.
Less common today
Cailan isn't in the latest US Top 1000. It last peaked at #5,938 in 2012.
A noble warrior and King of Ferelden Β· Dragon Age: Origins
US births per 5-year period, 1990βpresent (SSA data).