In the Soul Cross universe, roosters form an etnicity/nation, kinda like jews or gypsies in our world.
Some of the traditions of this nations is to name at least their first child with a combination of the names of their parents, and a mix of a dance or ritual fight using daggers or short swords. Oakel likes this dance and practice it using the colours of his family, purple and black.
Link
Blackdoge
"gitans" = gypsies, just an FYI