Laccunus

lak'-u-nus (Lakkounos; the King James Version Lacunus):

One of the sons of Addi who returned with Ezra and had married a foreign wife (1 Esdras 9:31). The name does not, as might have been expected, occur in Ezra 10:30. See note on the passage (in Lange's Commentary) as to the reconciliation of the lists in 1 Esdras and Ezra.