| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 41 | Ken | Japanese | Strong; physically healthy. | M | |
| 42 | Kenji | Japanese | Intelligent second son; strong and vigorous. | M | |
| 43 | Kenjiro | Japanese | Second son who sees with insight. | M | |
| 44 | Kentaro | Japanese | Sharp; big boy. | M | |
| 45 | Kumiko | Japanese | Companion child; drawing together. | F | |
| 46 | Kyoko | Japanese | Mirror. | F | |
| 47 | Maeko | Japanese | Truth child. | F | |
| 48 | Maemi | Japanese | Smile of truth. | F | |
| 49 | Maiya | Japanese | Surname meaning rice valley. | F | |
| 50 | Makoto | Japanese | Good. | M | |
| 51 | Manzo | Japanese | Ten thousand-fold-strong third son. | M | |
| 52 | Mareo | Japanese | Rare; uncommon. | M | |
| 53 | Mariko | Japanese | Ball; circle. | F | |
| 54 | Marise | Japanese | Infinite; endless. | F | |
| 55 | Marise | Japanese | Infinite; endless. | M | |
| 56 | Maro | Japanese | Myself. | M | |
| 57 | Matsuko | Japanese | Pine tree child. | F | |
| 58 | Michie | Japanese | Gateway; gracefully drooping flower. | F | |
| 59 | Michiko | Japanese | Child of beauty. | F | |
| 60 | Michio | Japanese | Man with strength of three thousand. | M | |