Ivka | | - | Croatian, Bulgarian, Slovak, Czech | |
Ivo (2) | | - | Bulgarian, Serbian, Croatian, Macedonian | |
Kalin | | - | Bulgarian | |
Kalina | | - | Bulgarian, Macedonian, Polish | |
Kaloyan | | - | Bulgarian | |
Kamen | | - | Bulgarian | |
Katerina | | - | Macedonian, Russian, Bulgarian, Greek, Late Roman | |
Kiril | | - | Bulgarian, Macedonian | |
Klavdiya | | KLAHV-dee-yah (Russian) | Russian, Ukrainian, Bulgarian | |
Kliment | | klee-MYENT (Russian) | Russian, Ukrainian, Bulgarian, Macedonian | |
Konstantin | | KAWN-stahn-teen (German), kahn-stahn-TEEN (Russian) | German, Hungarian, Russian, Serbian, Bulgarian, Macedonian | |
Kosta | | - | Bulgarian | |
Kostadin | | - | Bulgarian, Macedonian | |
Krasimir | | - | Bulgarian, Medieval Slavic | |
Krasimira | | - | Bulgarian | |