| Name | Meaning | Gender | Origin |
| Klaasr | People's victory. | M | Greek |
| Klara | Clear. | F | Latin |
| Klari | Clear. | F | Latin |
| Klarika | Brilliant | F | Hungarian |
| Klarissa | clear/ bright | F | German |
| Klarisza | Clear. | F | Latin |
| Klarysa | Clear. | F | Ukrainian |
| Klas | People's victory. | M | Swedish |
| Klaude | Lame. | M | Latin |
| Klaudi | Lame. | M | Latin |
| Klaudia | Lame. | F | Latin |
| Klaudio | Has a limp; lame. | M | Latin |
| Klaudius | Lame. | M | Latin |
| Klaus | Leader in Victory | M | German |
| Klazina | People's victory. | F | Greek |
| Kleavon | Variant of Cleavon: Cliff. | M | African-American |
| Kleef | cliff | M | Dutch |
| Klemenis | Merciful. | M | Latin |
| Klemens | Merciful. | M | Latin |
| Kleng | claw | M | Norwegian |
| Kleopatra | Glory of the father. | F | Greek |
| Kletos | Variant of Anakletos: Calling forth; summoned. | M | Greek |
| Klevon | Variant of Cleavon: Cliff. | M | African-American |
| Kliment | Merciful. | M | Latin |
| Knight | armored knight | M | English |
| Knocks | From the hills. | M | English |
| Knoton | Wind | M | Native American |
| Knowles | grassy slope | M | English |
| Knox | Hill | M | English |
| Knud | Kind. | M | Danish |
| Knut | Knot. | M | Norse |
| Knute | Knot | M | Scandinavian |
| Knutr | Knot. | M | Norse |
| Kobe | Supplanter | M | Hebrew |
| Koby | Dark; dark-haired. | M | German |
| Kochava | Star | F | Hebrew |
| Kodey | Variant of Cody: Cushion; helpful. | M | English |
| Kodie | Variant of Cody: Cushion; helpful. | M | English |
| Kodran | Father of Thjodgerd. | M | Norse |
| Kody | alternate form of Cody | M | English |
| Koen | Brave and gallant | M | German |
| Koenraad | Bold. | M | Dutch |
| Koffi | born on Friday | F | Swahili |
| Kofi | born on Friday | M | Twi |
| Kohana | Little Flower | F | Japanese |
| Kohath | Congregation/ wrinkle/ bluntness. | M | Biblical |
| Kohkahycumest | White crow or white antelope (Cheyenne). | M | Native American |
| Koi | Urge; implore. Also the Hawaiian equivalent of Troy. | M | Hawaiian |
| Kojo | Born on Monday | M | African |
| Koka | Scotsman | M | Hawaiian |