I found seven. Are there more?
Judges 9:52-54 - Abimelech (reasons: disappointment, upcoming degradation, shame)
1 Sam 31:4 - Saul (reasons: disappointment, upcoming degradation, shame)
1 Sam 31:5 - Saul's buddy in arms (impulsive, caught by the horror of the moment)
2 Samuel 17:23 - Ahithophel (reasons: disappointment, pride)
1 Kon. 16:15-20 - Zimri (disappointment)
Matt. 27:3-5 - Judas (guilt)
Judges 16:25-30 - Samson (reason: for God's glory)
The first 6 are self-centered, the 7th (Samson) is not.
The first 6 don't give the impression these were godly (saved) people, the 7th (Samson) is named in Hebrews in the list of the heroes of faith.
All 7 have in common a pattern of impulsiveness, it's not a struggle of months (years) typical for the serious depressed having fought 1000 battles against the inner pressure having won 999 times but losing the last one.
Other then the obvious that God is the giver and taker of life and thus (self-centered) suicide is sin I haven't noticed a clear condemnation in Scripture about suicide, let alone it is a salvation issue.