How do you spell carlos in spanish?

Using the Castilian ('Spanish Spanish', as against Latin American Spanish) pronunciation of the letters of the alphabet:

C - pronounced 'theh' (th' as in 'thin', not 'the')

a - pronounced 'a' as in 'bag'

r - pronounced 'erreh' (like '(b)eret', but with a trilled double 'r'

l - pronounced 'el'

o - pronounced 'o', bit like Northern English or Scots 'o' ('aw')

s - pronounced 'esse' (rather like English 'essay').