What is with everyone calling people by their last names?

Why does everyone in this show insist on calling everyone else by their last names??? Its so annoying sometimes. I mean they do have first names and it sounds a lot better and less forced when you say "Where is Sayid?" instead of "Where is Jarrah?" I mean thats all they do! "Where is Jarrah?" "Alpert will come back" "Linus killed him" "Where is Ford?" "Shepherd is here" I mean I'm so sick of it!

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