Laccunus

LACCUNUS lə ku’ nəs (Λακκου̂νος). A son of Addi who put away his foreign wife in the time of Ezra (1 Esd 9:31; KJV LACUNUS); prob. the same as Chelal in Ezra 10:30.

International Standard Bible Encyclopedia (1915)

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 Ezr 10:30. See note on the passage (in Lange’s Commentary) as to the reconciliation of the lists in 1 Esdras and Ezra.