For 2006 spawning, I counted TWENTY different kohaku pairings used by Sakai. The oyagoi names are - Yamato, M-Rose, Dancing Queen, Love Queen, Beauty Rose, Nozomi, Beauty Smile, R Kohaku, Ruby, Rose Symbol, New Symbol, Nemo, Love Symbol, Yokozuna, Dream Fujiko, Benibana Daioh, Benihanako, Tomahawk, Patriot and Botan II.
In the same year, Sakai had TWELVE different pairings for their sanke. The oyagoi names are - Zipangu, Flower Queen, Rainbow, Big Rose, Beauty IV, Shining Rose, Akizakura, Miss Japan, Wakashoryu, Wakashoryu II, Young Dragon, Hiryu and Koume.
Many of the sanke oyagoi were kohakus too, but paired with sanke males.
Got these from Sakai's parent koi brochure which Kentaro passed around earlier this year when he was in Malaysia.