男なん

noun, noun, used as a suffix, counter

son

Used mainly in compounds or as a suffix/counter for sons. Not a standalone word for 'son' in modern Japanese; the common standalone word is 息子 (むすこ).

• 彼かれは三さん男なんです。

  He is the third son.

• 長ちょう男なんは医い者しゃになった。

  The eldest son became a doctor.