"Rin" is short for Rinesme, which is a Japanese name. My daughter acquired Rin for her 16th birthday, and at that time she was crazy for everything Anime (Japanese comics of a sort). So we call her Rin, but the name always makes me think of a Wren or little bird....which is perfect because she's so tiny.
Tyson, well, I had him for well over a week before we decided on a name. I wanted something that fit his personality. I was in the kitchen making dinner and once again "little no name" was sitting with my husband trying to chew on his ear. He was always biting my husband's ear and Rin's ears. So DH was pulling him down, and said "who do you think you are, Mike Tyson?" I came out of the kitchen and said "that's it, that's his name!" Obviously I wasn't gonna name him Mike, so Tyson it is