Monday is a day-of-the-week name chosen in full awareness that Monday has a cultural reputation problem — it's the day everyone dreads, the official beginning of the work week, the subject of approximately ten thousand memes about coffee dependency. Naming a pet Monday is a reclamation: this particular Monday is something worth being excited about.
Day Names as Pet Names
Day-of-the-week names appear occasionally in pet registries, with Friday and Sunday carrying the most positive cultural associations and Monday carrying the most ironic. Monday as a pet name says something specific about its owner: someone who finds the reclamation of a unloved thing genuinely satisfying. It's in the same spirit as naming a dog Rainy or a cat Grumpy — taking a negative valence and transforming it through affection.
The Robinson Crusoe Layer
Daniel Defoe's Robinson Crusoe named his companion Friday after the day they met, establishing the literary precedent for day-of-the-week naming. Monday extends that tradition with a specifically 21st-century energy. The gender-neutral registry status is accurate — the name carries no inherent gender signal, which some owners find appealing.
Counter-Reading: Explaining the Choice Repeatedly
Every single time you introduce your pet as Monday, someone will ask why. That is either the most delightful thing about the name or a significant social tax depending on how much you enjoy telling the story. Owners who don't enjoy repeating themselves may want to consider Sunday, which carries the same day-name structure with considerably less cultural friction.