The name Adonikam in the Bible
There's only one man named Adonikam in the Bible, although he plays no role in it. His family is reported among the second wave to returned from exile by both Ezra, who counts 666 members (2:13) and Nehemiah, who counts 667 members (7:18). Ezra reports a secondary surge of Adonikamites returning with the second wave, and counts 63 males, among whom Eliphelet, Jeuel and Shemaiah (Ezra 8:13).
Etymology of the name Adonikam
The name Adonikam consists of two elements. The first part of the name comes from the familiar Hebrew word אדן (adon), roughly meaning lord:
The word adon post-fixed by the letter י creates a possessive form: אדני (adoni), meaning my lord, or lord of, depending on the context.
The second part of the name Adonikam comes from the root קום (qum), meaning to rise up or stand:
For a meaning of the name Adonikam, BDB Theological Dictionary and NOBSE Study Bible Name List both read My Lord Has Risen. Alfred Jones (Dictionary of Old Testament Proper Names) goes with the derivation קים (qim), meaning adversary, and reads rather oddly Lord Of Enemies.