John Gill Commentary Psalms 109:21

"But deal thou with me, O Jehovah the Lord, for thy name`s sake: Because thy lovingkindness is good, deliver thou me;" — Psalms 109:21 (ASV)

But do you for me, O God the Lord, for your name's sake
The sense of the petition is, and which is a prayer of Christ as man, that the Lord God would take his part, be on his side, be present with him, work with him, help and assist him, and that for his own honour and glory, for his truth and faithfulness sake, who has promised him help and assistance, (Psalms 89:21–23Psalms 89:34) .

Because your mercy is good, deliver you me ;
or "your kindness" ^F7 ; meaning the lovingkindness of God to Christ, which he always bore to him, and was eminently and superlatively good; which he makes use of as an argument for his deliverance out of all his troubles, and from death itself; see (Psalms 69:14Psalms 69:16) .

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FOOTNOTES:

• F7: (Kdox) "benignitas tua", Musculus, Junius & Tremellius, Piscator.