Two sons were born to Eber: One was named Peleg, because in his days the earth was divided, and his brother was named Joktan.
Jewish Publication Society of America Version (JPS1917) - 1 Chronicles 1:19 >And unto Eber were born two sons: the name of the one was Peleg; for in his days the earth was divided; and his brother's name was Joktan.