I actually named my son Tynan (19 years ago) intentionally, knowing what it means because I really liked it and thought Ty was a great short version. He uses both but most people call him Ty. We were in Ireland years later and saw that it is a very common last name there. BTW, my son was born with lots of dark hair (Dark One) but is now a pretty white guy with light brown/blonde hair. So much for the Irish roots.