The disproportion between the gentle cook and his lethal lineage is positioned as the engine of the next arc, and Robin’s half-memory plus Pekoms’s blunt “killers” framing mark the name as load-bearing.
The payoff
(Pending — the full nature of the Vinsmoke Family, and why Sanji hides his name, pays off forward of this window (Whole Cake Island). Keep status: pending.)
Earliest known caller
(Unknown.)
Why this matters
Oda surfaces a hidden, dangerous lineage for an established Straw Hat the moment the wedding plot lands — a name-etymology + chekhov-explicit + dialogue cluster. The name itself encodes the tell (“Vinsmoke” = French vin “wine” + English smoke — keyed to Sanji’s chain-smoking and the crew’s French culinary-combat naming), and a senior character’s flat statement (“a family of killers”) plants the contrast that the coming arc will detonate.