The sources checked do not record Nanko as a personal name or give it a meaning.
Affection
Cute
Gold, Beige, Black, White
Any Size
Unisex
Japanese
N
5 Letters
Recorded as a given name in african american use, masculine and feminine
A diminutive of Alfred
Recorded as a masculine given name in Amharic
A Japanese surname, written ちば, 千葉 or 地場