In chapter 385 Lucci states
You learn the name of the fruit when you gain its power
- so why did Luffy not learn the name of the Human-Human Fruit, Model: Nika after eating it?
- or did he mean you name the fruit yourself after learning of its abilities?
after Luffy ate the fruit, he came up with the title GumGum … maybe he came up with that name after witnessing the rubber properties he got … But I think Shanks told him that name, and he chose it over whatever the fruit told him.
In over 1000 chapters, there is still no evidence that fruits tell their names to their users. In fact, in 800 years, no one has awakened Luffy’s fruit, but possibly it has had other users. Despite this, the name has remained a secret for eight whole centuries. Luffy has been using the fruit’s powers for years and has met people who knew about the void century, but he has not known about the real name of his fruit until he met Vegapunk.
Lucci’s phrase has been misinterpreted based on assumptions that have no basis or logic. As Occam’s razor states, the hypothesis that requires the fewest assumptions is usually the correct one.