On'yomi and Kun'yomi
音読み・訓読み (おんよみ・くんよみ)
The two main categories of kanji readings in Japanese: on'yomi (Chinese-derived) and kun'yomi (native Japanese), both of which play crucial roles in personal name construction.
On'yomi (音読み) and kun'yomi (訓読み) are the two fundamental systems of kanji pronunciation in Japanese. On'yomi are readings derived from the original Chinese pronunciation of a character, imported along with the writing system over centuries of cultural exchange. Kun'yomi are native Japanese readings assigned to kanji based on the meaning of existing Japanese words. For example, the character 山 (mountain) has the on'yomi 'san' (as in Fuji-san, 富士山) and the kun'yomi 'yama' (as in Yamada, 山田).
Application in Personal Names
In Japanese names, both on'yomi and kun'yomi are used extensively, and the choice between them significantly affects a name's sound and feel. Kun'yomi readings tend to sound more traditionally Japanese and are common in given names: Haruka (はるか), Takeshi (たけし). On'yomi readings can give names a more formal or literary quality: Shūichi (秀一), Kenji (健二). Surnames overwhelmingly use kun'yomi, while given names may use either system.
Complexity and the Naming Challenge
The dual reading system is a major reason why Japanese names are so difficult to read correctly. A single kanji in a name might be read using its on'yomi, kun'yomi, or a name-specific nanori reading. The character 大, for instance, has the on'yomi 'dai' and 'tai,' the kun'yomi 'ō,' and nanori readings like 'Hajime,' 'Takeshi,' 'Masaru,' and 'Hiroshi.' This multiplicity of readings means that meeting someone new in Japan almost always involves confirming how their name is pronounced — a social ritual that reflects the profound depth and complexity of the Japanese writing system.