Along with Jehoiachin, the prophet Ezekiel was also taken into captivity (Ezekiel 1:1). The book of Ezekiel dates events in his life based on the years since Jehoiachin's capture.
The 10,000 people taken captive by Nebuchadnezzar likely included:
7,000 troops,
1,000 craftsmen and artisans, and
several administrative officials and leading citizens of Jerusalem.
The number 10,000 is probably an estimate (see also Jeremiah 52:28).