No too long, something simple and short, and easy to remember. Like 

Aoi 

Nao 

Aya 

Izumi

Junko 

Kazumi 

Kaz 

Kei 

Ko 

Kyo 

Mika 

Miki 

Moe 

Ran 

Rei 

Rie 

Rika 

Ren