Albert Barnes Commentary Psalms 31:3

"For thou art my rock and my fortress; Therefore for thy name`s sake lead me and guide me." — Psalms 31:3 (ASV)

For you are my rock and my fortress — see the notes at (Psalms 18:2).

Therefore for your name’s sake — for the sake of your own honor, or for the glory of your name. See the notes at (Psalms 23:3).

That is, since you are my rock and my defense—since I put my trust in you—show, by leading and guiding me, that my trust is well founded, or that this is Your character, and that You will be true and faithful to those who commit their all to you. See the notes at (Psalms 31:1).