Raddai is the fifth son of Jesse, and older brother of David (1 Chronicles 2:14). He's mentioned but plays no further role in the Bible.
The name Raddai looks like an imperative of the verb (yarad), go down. It's used as such in Isaiah 47:1 and Jeremiah 48:18: Come down...!
BDB Theological Dictionary and others however suggest that the name Raddai comes from the verb (radad), beat down, subdue (Isaiah 45:1, Psalm 144:2). The added yod, some suggest, is a remnant of the name of the Lord YHWH.
For a meaning of the name Raddai, NOBS Study Bible Name List reads Yahweh Has Subdued. Jones' Dictionary of Old Testament Proper Names reads simply Subduing.
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(yarad), go down. It's used as such in Isaiah 47:1 and Jeremiah 48:18: Come down...!
(radad), beat down, subdue (Isaiah 45:1, Psalm 144:2). The added yod, some suggest, is a remnant of the name of the Lord 
