Worldwide, Karthiyaini (Karthiyaini 
) is a very rare girly given name. The forename Karthiyaini is characteristic of Southern Asia, particularly India, where it is an extremely rare female name. Much less frequently, Karthiyaini is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Karthiyaini | India, Malaysia |
Yaini, Karthi, Kunjoo, Selvaraj, Vetrivel, Sivaraman, Pugazendiran, Devarajoo, Thinaseelan, and Damodharan