Naming a hybrid if you aren't the orginator

[Harris E.]

Hi there,

I'd like to name a plant in my mother's honor for her birthday this year. I have an un-named oncidium intergeneric (Bratonia Charles M. Fitch x Oncostele Black Beauty) that I think is a good choice. I've researched the plant to the best of my internet ability to determine that is in fact not registered with the Royal Horticultural Society but I can't figure out who is the originator of the cross. It's my understanding that without that piece of information I cannot register the name myself. Does anyone have any ideas for how I can track down the originator or how I can get around having to find them? Here's a picture of the bloom just for fun...

Thanks so much!

Harris