I found the names of the Daughters Of Aku. Someone on Tumblr posted a picture of all the female assassins and their names were there. Four of them are confirmed to be canon, while the other three remain a mystery. Here they are:
1. Ashi*
2. Ari
3. Aki*
4. Ami*
5. Ani
6. Avi*
7. Ali
*Confirmed. If Samurai Jack, Season 5, is released on DVD and Blu-Ray, maybe their names will be revealed on the Bonus Features.
I request permission to post your artwork of the Daughters Of Aku, with their names posted.