My interpretation: Google for your intended usage; if it seems novel, good. Make sure you document so the next person who Googles for it sees you're already semantic-squatting on that name in context.
Not pretty for those who like certainty and formality, but very in tune with how things can work with global search.
"Note: If the relevant parameter name space has conventions about associating parameter names with those who create them, a parameter name could incorporate the organization's name or primary domain name"
"4. SHOULD identify a convention to allow local or implementation-specific extensions, and reserve delimeters for such uses as needed."
As has been mentioned by another commenter[0] these parts invite the drawing of parallels to CSS vendor prefixes.
