What is the etymology of the name "Lastil"?
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Etymology has no (^^;) particular deep meaning.
When I name it, I am generally conscious of "readability" and "less used words". In rare cases, I sometimes think about the origin and etymology, but I usually give it the name that came up at that time. "Lastile" is also a name that happened to come to mind when naming it.
When you come up with a name, find out how much it hits in a Web search, and at least hire it (^^;).