For thou art my rock and my fortress - See the notes at Psalms 18:2.
Therefore for thy name’s sake - For the sake of thine own honor, or for the glory of thy name. See the notes at Psalms 23:3. That is, since thou art my rock and my defense - since I put my trust in thee - show, by leading and guiding me, that my trust is well founded, or that this is Thy character, and that Thou wilt be true and faithful to those who commit their all to thee. See the notes at Psalms 31:1.