creative names.

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When does creative get too creative?

I've seen comments about adding a "y" or an "ee" or whatever being called the creative spelling. I was born in 1990 and know a bunch of people with the same names, but different spellings. Some of the more popular examples (that I personally know/have heard):
-Megan / Meagan / Meghan / Meaghan
-Alison / Allison / Alyson / Allyson
-Caitlin / Kaitlin / Katelyn
-Catherine / Katherine / Kathryn
-Sean / Shawn / Shaun
There are a fair amount of others I can think of, but I won't bother listing them all.

I guess I'm just wondering about creativeness. With the names above, I feel like there was (at least at some point) one "correct" spelling, variations made and maybe considered creative, and eventually became accepted as alternative spellings. So.. I think I'm just asking about creativeness in general. What are you okay with, what do you not like at all? I think "Aiden" is already an accepted variation to its original of "Aidan" but "Ayden" or anything else seems wrong. I'm okay with the "y" in Brian/Bryan, but I'm wondering if it's because I'm used it as being a "normal" alternative. How much creativeness can you handle?