David Hershey schreef

It was not a sense of humor but a fact that anyone can coin a commom
name for a plant, even by accident.

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Coining a name is one thing (often fueled by a sense of humor), but that
does not make it a common name
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There are millions of plant common
names and often dozens or hundreds for a single species. If a common
name is used, even on websites or in conversation, then it becomes a
common name by default.

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Not by a long way. If you have a cat and you call him "whiskers" and your
daughters take to referring to other cats as "wiskers", this does not make
"whiskers" a 'common name' for cats.
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I said that even if iapacho originated as a typo, it would still be a
valid common name because it is in use. Do you know for a fact that
iapacho arose due to a typo, or does it represent an alternate
spelling or a native term?

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It is definitely a typo
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http://www.ou.edu/cas/botany-micro/ben/ben109.html

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Nice site, supporting what I say. It warns against attempting to
artificially introduce common names
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What science has to do with your vague criticisms of a webpage is that
scientists are supposed to be specific. [snip]
David R. Hershey

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Depends on circumstance. There is a technical name for "being specific" at
length on topics you have no power to change just for the sake of filling up
space: it is called "gossip". It is not supposed to be a scientific
endeavour.
PvR