Jonas
JONAS, JONA (jō'nas, jō'na, Gr. Iōnas, Iōna)
JONAS jō’ nəs (̓Ιωνάς). KJV Apoc. and NT form of Jonah (Matt 12:39; 16:4; Luke 11:29, 30); KJV form of John in John 21:15-17.
International Standard Bible Encyclopedia (1915)
(Ionas; the King James Version, Jonan):
(1) Son of Eliasib (1 Esdras 9:1).
(2) Corresponds in 1 Esdras 9:23 to "Eliezer" in Ezr 10:23.
(3) The prophet Jonah (2 Esdras 1:39; Tobit 14:4,8).
(yonah, or yochanan; Iona):
(1) The name given in Mt 12:39-41; 16:4; Lu 11:29-32 the King James Version to the Old Testament prophet Jonah (the Revised Version (British and American) renders "Jonah").
See Jonah.
Jonas may be a contraction for Joanes (Keim). It has also been suggested that the father of Simon may have had a double name, Jona-Johannes (compare F. H. Chase in HDB, article "John, father of Simon Peter").