The name of the goat-like Wesen man is 'Billy Capra', "Capra" is the name for the taxonomy group that contains all species of goats; Billy is a term used to describe male goats. "Capra" is the Italian term for "goat". The name of the character "Billy Capra" would therefore translate "Billygoat"
The basis for this episode and the opening quote come from "Bluebeard" - the earliest recorded version of the story that remains is from Charles Perrault. One of the Grimm versions is called "Fitcher's Bird" and features the plot-device of the ability to seduce a woman to helplessness with a single touch (Bluebeard/Fitcher is here a wizard), as well as the specific number of three women brought to the "castle."
The Bramble Haus is really The Lion and the Rose B&B in Portland, Oregon
Sasha Roiz (Captain Renard) was raised in French Canada and speaks fluent French in real life. Showrunners decided to use this (and later, his fluent Russian) when they learned it.
The waterfall in this episode is the Multnomah Falls, located east of the Portland metro area along I-84.