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The surname Snellen can be either Dutch or English:
1) For families of Dutch origin: Probably derived from Dutch snell "quick", "lively"; (bognate of German adjective schnell "fast")
2) For families of English origin: Snellen is a corruption of Snelling, from Old English snel, snell , "smart", "active", "bold", which in turn is derived from Old Norse snjallr. See Snelling.
Obviously, these surnames are etymologically related and can both be categorized as surnames that are derived from nicknames.