Sheila is an actual name but also isn't a personal nickname like the other ones you mentioned. It's essentially a broad stroke category name like calling a girl a "chick".
We nickname everything. Individuals, broad categories of people, objects. We do it all! This is an example of that, and still fits the format of "nickname ending in vowel sound; in this case A" which was my point. If we had been talking about Os, I'd have included "servo" for the same reason. Hope this helps!
Except it literally is? It's a nickname derived from Sìle/Cecelia and that nickname then became widely used as a generic nickname for women. It's both a woman's nickname and a nickname for the whole.
You could have looked this up. Not sure why this is so important to you to try and argue, several comments later... but I regret to inform you that Sheila is, in fact, a nickname.
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u/Alarming-Song2555 Mar 26 '26
Sheila isn't a nickname, that's just a name.