You can say a hundred names easily. Coworkers, exes you're actually over, people from a group chat you left years ago. Then there's the one that needs a half-second first — a tiny intake of breath before your mouth can be trusted with it.
It's not always the person you loved most. Sometimes it's the one you loved worst, or last, or first. What makes a name do that to you isn't the size of the love. It's that the name is still wired to a version of you that doesn't exist in daylight anymore — the one who waited by a phone, who rehearsed a sentence in the shower, who believed a specific future was going to happen and built a little room for it in their chest.
The room's probably empty now. Furniture's gone. But you kept the key, and the name still fits the lock.
Whose name does that to you? When's the last time you let yourself actually think about why, instead of changing the subject in your own head the second it came up?