Is there any evidence in your family history, that YOCUM and other spellings of that name, may have originated with King Jehoiakim of Judah? He reigned over Judah from 609 BCE (BC) to 598 BCE (BC).
His son Jehoiakin was carried off to Babylon shortly before the First Temple built by King Solomon and Jerusalem were robbed of their gold, silver and valuables. Jerusalem and the First Temple were then completely destroyed by the Babylonians under the rule of King Nebuchnezzar in 596 BCE (BC). [Reference 2 Kings Chapters 23 and 24]