Like all babies, I often mispronounced words, including my sister's name.
However, to this day, I still mispronounce her name because it stuck with me for so long, so it's what I call her now. In fact, my other siblings say her name incorrectly because of me. I guess it started off as a tease, but the mispronunciation stuck with them, too, and they got used to it.
Also, I have the only normal name of all my siblings.