Modern Greek:
thumb: μεγάλο δάχτυλο “big finger” (vernacular)
thumb: αντίχειρας “opposite to the hand” (formal)
index finger: δείκτης “pointer” (i.e. index) (formal)
middle finger: μέσος “middle”
ring finger: παράμεσος “next-to-middle”
little finger: μικρό δάχτυλο “little finger” (vernacular)
little finger: ωτίτης “ear finger” (i.e. use to scratch the ear) (formal)
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If you go online, you’ll see that at least one person on Twitter has called the middle finger “Varoufakis”…