How to pronounce Kioumars?

ki-you-Mars
'Kiou' is pronounced like 'Q' (with its vowels) when reciting alphabet.
In 'mars', all the vowels and consonants (esp. r and s at the end) are pronounced. the vowel 'a', however, in like 'a' in 'apple', not 'a' in 'father'.

First name

Persian (Iran)

Male

The human being, Adam, The first king of Iran (Persia) in Persian mythology

This name is an old name, whose spelling and pronunciation has changed over thousands of years in its country of origin, due to influence of other languages, change in script, and local variations. An older and perhaps more original pronunciation which is still common in rural regions of Iran (away from Tehran) is ka-you-mars or ka-you-marz. (ka as in cat). A Persian literature teacher once told me that the name comes from ka-you-maretha.