David,
I think Purachina is Japanese!
Pronuciation;
PRA-CHIN-A, meaning Platinum.
Ogon - OH-GONE, meaning Gold.
The first Platinum Ogon was bred on 1963 by Mr. Tadao Yoshioko as a result of pairing a Ki-goi (Non metallic bright Yellow Koi) with a Nezu Ogon (A silver grey Koi with a dull metallic lustre)
This variety was originally called Shirogane, which means White Gold.