It should be:
"If you tripped every time someone mentioned your name, you would be dead by now"
"If you had tripped every time someone mentioned your name, you would have been dead for ten years by now". Subjunctive requires the past or past perfect.
The tenses must follow the proper sequence of tenses. One cannot mix "if you tripped" and "mentions your name" and "would have been dead by now" (this would have to be "would have died by now" to match "tripped" and "mentioned").
The sequence of tenses is difficult.
"If you trip every time someone mentions your name, you will die soon"
is a present conditional.