There are a lot of factors. You are dependent on the script writer of the manifest and the transcriber. (and hopefully there wasn't a hole, tear, rip, ink blot or folded crease over their names).
The "B" could be a "P" - the lower loop of the B wasn't closed or was smudged, faded, et al. The "n" could look like an "r" and then it may look like Power. Or Bower. The "o" may not have closed completely and the transcriber thinks it is a "u". The "e" could look like an "i". Those are some of the possibilities. Sometimes it is worth it to search by first name only, approx. birth year & country of origin. Jehdiah could be a good start. Use wild card search
too ... Bow* (use the asterick).