As a nickname, no common name is ever wrong, just more or less common than several other nicknames that most plants have. Just like a person might be called "sweetie" by their Mom, "Dad" by their kids, some kind of sporty name by teammates... plants also have many nicknames. Even if you're the only one using it, it's not wrong, just the least common common name. There can be a vote to find the most popular, but that also wouldn't establish the other nicknames as wrong, just less popular.
That's one of the things I love about the database here, that it's possible for folks to add the common name they're using and many plants show a multitude of common names. That allows those plants to be found by any of those names here - and connects them all to the botanical name. Some common names of plants have an interesting, fun, educational, &/or historical story behind them. And who shows a friend or neighbor their plants and says (in person, verbally) stuff like, "here's my Kleinia petrea and Crassula ovata?" They probably say, "here's my trailing Jade and regular Jade."
Any time specificity is required, the botanical name can be used/established, then there will be no confusion.
If one does an image search for "elephant ear plant" many pics of Caladiums come up, a lot of people are using that as a common name for them.
