Searched for どんかん. You can also try a search for "donkan".
Names — 2 found
ドンかんたろう
【ドン貫太郎】
1. Don Kantarou
どんかんりょく
【鈍感力】
1. The Power of Insensitivity (book by Junichi Watanabe)
Searched for どんかん. You can also try a search for "donkan".