Great name! And great question.
Blue was born on Christmas Day & his former owner named him Nicholas aka Nick. When Kari gave Nick to me & the name, Nicholas/Nick did not seem fit him. I was thinking of naming him Azul because he looked bluish and I always liked that name. When I asked my mom what she thought of Azul and she asked me why Azul, I said because he looked like blue & he responded to Blue. I said it again, he came to me. I figured he liked the name. Sake is Japanese wine & for some reasons my niece liked this unusual word very much and begged me to let her name him Sake. He responded to Sake, too. I liked Blue very much and decided to let him have both name--Blue Sake.