| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 61 | Jirina | Czechoslovakian | Feminine form of Jirka. | F | |
| 62 | Jirka | Czechoslovakian | Farmer. | M | |
| 63 | Josef | Czechoslovakian | May God give increase. | M | |
| 64 | Jozka | Czechoslovakian | God will multipIy. | M | |
| 65 | Kafka | Czechoslovakian | Bird. | M | |
| 66 | Kaleen | Czechoslovakian | A flower name and place name. | F | |
| 67 | Kaleena | Czechoslovakian | A flower name and place name. | F | |
| 68 | Kalena | Czechoslovakian | A flower name and place name. | F | |
| 69 | Kalene | Czechoslovakian | A flower name and place name. | F | |
| 70 | Kalina | Czechoslovakian | A flower name and place name. | F | |
| 71 | Kopecky | Czechoslovakian | Hill. | M | |
| 72 | Kovar | Czechoslovakian | Smith. | M | |
| 73 | Kozel | Czechoslovakian | Goat. | M | |
| 74 | Kral | Czechoslovakian | King. | M | |
| 75 | Kramoris | Czechoslovakian | Merchant. | M | |
| 76 | Krany | Czechoslovakian | Short. | M | |
| 77 | Krasava | Czechoslovakian | Beautiful. | F | |
| 78 | Krasna | Czechoslovakian | Beautiful. | F | |
| 79 | Krejci | Czechoslovakian | Tailor. | M | |
| 80 | Krocka | Czechoslovakian | Moves slowly. | M | |