| 321. | KOSTAN | From Latin name Costantinus. In Arm. this name has the forms Kostandin, Kostand. The corresponding surname is Kostanyan. |
| 322. | KOSTANDIN | From Latin name Costantinus (constans "strong", "durable"). The short forms are Kostik, Kostya. The corresponding surnames are Kostoyan, Kostikyan. |
| 323. | KRIST | Is the short form of the name Kristapor that is used independently. |
| 324. | KRISTAPOR | From Greek name Khristoforos "bringing Christ" which is met among all the Christian nations since V c. It is a rare name now. |
| 325. | KTRICH | From Armenian ktrich "hero", "brave". It is almost forgotten now. |
| 326. | KYUREGH | From Greek name Kurillos (Latin Cyrillus, Russian Kirill). This name is out of use unlike the corresponding surname is Kyureghyan. |
| 327. | LACHIN | From Azerbaijan lacin "hawk". It is a rare name now only the surname Lachinyan is met. |
| 328. | LALABEG(Lalabek) | From Persian lala "trainer", "tutor" and beg "prince". The corresponding surname is Lalabegyan (Lalabekyan). |
| 329. | LALAZAR | From Persian lalazar "tulip garden". The corresponding surname is Lalazaryan. |
| 330. | LAZAR | From Greek name Lazaros. In Arm. there are also the forms Ghazar, Ghazaros (l>gh Arm sound alter). The diminutive forms are Lazarik, Lazrik; the corresponding surname is Lazaryan. |
