Buck could have asked, or sifted back in the journal's entries, or just waited for that heavy handwriting to show up again, but. Well. He hasn't said hello properly to his betters in a while, distracted by work, and he might as well kill two birds with one stone (and he misses it, that subtle drumbeat rush that hums through the blood when the ancestors are called, when the gods touch down to allow him to attend to them, but he doesn't think on that too long). Finding someone's name from their handwriting: not a typical sort of sympathetic magic, but there are many ways to walk the Gran Chemin, and calling on The Great Road and asking it to help you wind your way along some unusual route is a way to earn yourself the amusement of all the loa who Legba tells your story to (and Buck has found their amusement as useful as their favor, over the years, hears their laughter licking around the edges of his mind every now and again and knows their eyes are on him, which pleases him more than the blessings of less capricious spirits ever could). An offering of tobacco and coffee thick and black as road tar, and some chanting and bullshitting (for it's a fool who treats his gods as strangers when they're condescending to speak with him face to spirit), Buck blows out the candles and clears away the salt lines and leaves the offerings at the altar that dominates his living room.
Then, job done and only slightly burning question answered, he sleeps for a day and a half. Only then does he eat, pack up the order and show a sign of life and leisure by doodling in that other, more public journal. First up is sorta business, sorta not-quite pleasure: the formula that finally worked and the name he has so recently ferreted out written down together tidy as a math problem, Locked to Tracy Dockett etched neat and square in the handwriting he reserves for business notes and other things that need deliberate handling.
The rest is more simple. Buck has disappeared in the usual manner of Buck-working-on-a-Project, his radio silences surely as familiar to those who regularly troll the journal network as his inevitable sprawling, cryptically exuberant resurfacing.
Victory!