Conversation so far:
What is Lapp?
The word Lapp can be traced to Old Swedish lapper, Icelandic lappir (plural) of Finnish origin; compare Finnish lappalainen Lapp, Lappi Lapland
What does Lapp mean?
Possibly meaning wilderness in the north, the original meaning of Lapp is unknown.
Are there any other interesting aspects about the Sami people article?
The Sámi are often known in other languages by the exonyms Lap, Lapp, or Laplanders, although these are considered derogatory terms, while others accept at least the name Lappland
Who was Johannes Schefferus?
Johannes Schefferus was one of the most important Swedish humanists of his time. He wrote the story of the Sami people, Lapponia in 1673.

Question: Can you tell me more about the terminology?
Self-contained rewrite: Can you tell me more about the terminology Lapp?