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Compared to fountain pens and ballpoints, "Sharpies" are actually the least sharp pen type.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
I suppose their name could also be meant to imply that they're meant for sharp people, to write down ideas with.
However, in all my time in meetings I would say they're rather meant to write ideas on flipcharts with that'll lead to a sharp decline in business value. ๐
It seems that the etymology isn't on Wikipedia. I'd assume the name is in reference to sharp lines that you can write or draw with it.