[Surname] Re: Surname Pech
The surname Pech is from Middle High German pech 'pitch, tar', presumably a nickname for someone with exceptionally dark skin or hair, or a metonymic occupational name for someone who prepared, sold, or used pitch. Pechau is a placename in Germany but there's nobody with that surname there now as you can see at tinyurl.com/y3upux98.
There are references to a Julius Ferdinand Pech from Germany who settled in Iowa at tinyurl.com/y3jcqbao and tinyurl.com/yyqzgrop.