Not op, but what got me to name (fleeting) notes quickly is to name one main category/author, one subcategory (both limited to a single word) and just the date (year only for citations). Inspired by bibtex keys:
Depending on your sorting preference, put the date first, second or last (I prefer sorting by main category, then date of entry, then subcategory). I use decimals instead of underscores but to each their own.