If this is the type of error you want to minimize, NATO phonetic alphabet [1] is worth learning. (Amateur radio is a good place to practice, though I'll admit I'm a bit rusty.)
I actually kinda enjoy these minor discrepancies, because it exposes who has sold my customer data and to whom -- though I've never gone as far as giving anyone intentionally incorrect data with this purpose in mind. I remember my parents also being amused with these copied mistakes, and with greater frequency. Seems plausible that the error rate goes down when most of my utilities/accounts were self-created online instead of typed in from a handwritten form or during an onboarding phonecall.