Varuna

http://en.wikipedia.org/wiki/Varuna

Bhrgu and Valmiki 
http://usju.blogspot.com/
http://v1lm.blogspot.com/
were specific sons of Varuna, 

Whereas Agastya and Vasistha Rsis 
http://2twi.blogspot.com/search/label/Urvashi
were common sons of Varuna and Mitra

Daughter Varuni
http://oce8.blogspot.com/search/label/Varuni