Do many kids know about
Lucifer? I think here they don't. They know about the devil but not about the name, that comes later (in puberty) when they read more about it etc in school. But I live in a super non-religious area so people would come into contact with
Lucifer in religious education class and in elementary school they only told us about the good stuff (of all religions, not just
Christian religions) and later on it was more about analyzing and
Lucifer came up then. When they say something about the devil it is usually "the devil" and not
Lucifer. But in elementary school it is more about the nice parts,
Mary,
Joseph and the birth of
Jesus - well any nice kid friendly story basically.
Yes, at least there are nickname options and at least in the US it's relatively easy to change a name (here it is pretty much impossible). And yes,
Luke works.
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https://www.behindthename.com/pnl/6232