Adonikam
Adonikam is a Biblical figure whom the Lord sets up, one of those "which came with Zerubbabel" (Ezra 2:13). His "children," or retainers, numbering 666, came to Jerusalem (8:13).
References
This article incorporates text from a publication now in the public domain: Easton, Matthew George (1897). "article name needed". Easton's Bible Dictionary (New and revised ed.). T. Nelson and Sons.