Last name Greičiūnas (Greičiūnas 
) , worldwide, is a very rare cognomen. The family name Greičiūnas is habitual in Northern Europe, particularly Lithuania, where it is a rare surname.
| valentinas greičiūnas Lithuanian politician, LT (b. 1939) |
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| vytautas greičiūnas LT (b. 1944) |
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