It’s true! I have met many a little [name]Clemmie[/name] - it’s sweet, but as nicknames go, it doesn’t bowl me over. That said, personally I would be fine with other people calling my hypothetical daughter [name]Clementine[/name] ‘[name]Clemmie[/name]’ if I could still call her [name]Clementine[/name] - which I could.
You could use [name]Emmie[/name], but [name]Emma[/name] is so popular … [name]Tina[/name] is a little dated, too.
I’ve never been to Australia, but here in [name]England[/name] we love nicknames, too, but I still know many people with longer names (an [name]Adelaide[/name], a [name]Helena[/name] and an [name]Eleanor[/name], several Victorias, Elizabeths, and Catherines, for example) who only go by their full name. They introduce themselves as [name]Adelaide[/name], don’t prompt any nicknaming, perhaps make a point of saying “Oh, I hate [name]Addie[/name]. I’m so glad that no-one ever calls me [name]Addie[/name],” and people don’t nickname them, or when they do it is unrelated to their name (I used to teach a [name]Catherine[/name] who was Bean amongst her friends, and always [name]Catherine[/name] otherwise).