"He has everything" almost never means he has everything. It usually means he buys what he wants immediately, so there is no wish list left over for you. That is a different problem, and it has three reliable solutions.
Upgrade something he uses every day but never thinks about. Buy a consumable good enough that he would not buy it for himself. Or solve a small problem he has decided to live with. All three work inside a Secret Santa budget.
Strategy 1: upgrade the daily object
Look at what he touches every single day and find the version that is two tiers better. Most people run permanent low-grade versions of things they use constantly, because replacing a working item never feels urgent.
Candidates: his socks, the pen in his bag, his phone charging cable, his water bottle, his keyring, his shoe care situation, the towel he actually uses. None of these are exciting to describe and all of them get noticed within a week.
- Merino socks. The most reliable version of this strategy. He will not buy them, he will wear them constantly.
- A refillable pen with real weight. Replaces whatever free pen he has been using for two years.
- A better keyring or carabiner. Small, and the improvement is felt every time he leaves the house.
- A serious insulated bottle or tumbler. Upgrade the lid, not just the brand. Sealing lids are the actual improvement.
Strategy 2: buy the consumable he would not buy
Consumables sidestep the whole problem. He cannot already own it because it gets used up, and there is no clutter risk. The trick is buying the good version of something ordinary rather than something exotic.
Single-origin coffee, real olive oil, a small-maker chocolate set, aged hot sauce, good tea, a decent bottle of something if he drinks. The bar is simple: it should be noticeably better than the supermarket version and clearly not something he would pay for himself on a Tuesday.
Strategy 3: solve the problem he tolerates
Everybody has a low-grade annoyance they have stopped noticing. His charger situation, the tangle of adapters in a drawer, the pile on the entry table, the wallet he empties into a bowl every night, the thing he loses monthly.
If he is the guy who is always patting his pockets, that is a solved problem now. The Metal Brik puts his ID, 7 to 8 cards, folded cash, and keys into one anodized aluminum body and includes a rechargeable tracking card, so a misplaced wallet can be rung from his phone or found on a map. At $69.99 it fits a higher-cap exchange, and it replaces something he already carries rather than adding an object.
Same logic applies at lower prices. A cable pouch, a valet tray, a car trash bin, a good pill or first aid kit for his bag. Unromantic, immediately used.
What not to buy him
Skip anything in a category where he is an enthusiast. If he is into coffee, whiskey, cycling, or knives, he has opinions you do not have access to, and a well-meant guess lands badly. Buy adjacent instead: good beans for the coffee guy is fine, a grinder is not.
Skip decor, skip novelty, and skip anything requiring an account or an app. A man who buys what he wants has already declined most gadgets on purpose.
For more angles on this, see gifts for men who have everything and what men actually want as gifts.
Quick answers
What do you get a guy who has everything for Secret Santa?
Upgrade something he uses daily but never replaces, such as socks, a pen, or a keyring. Buy a high-quality consumable he would not buy himself. Or solve a small daily annoyance he has decided to live with.
Are consumables a cop-out as a gift?
No, as long as it is the good version of something ordinary. A bag of coffee from a real roaster reads as considered. A generic gift basket does not.
Should I buy a gift in his hobby category?
Usually not. Enthusiasts have specific preferences you cannot guess. Buy something adjacent and consumable instead of equipment.