My ggg grandmother was Catherine Barbe Gerst born 30 Aug 1802 in Pfaffenhoffen, Bas-Rhin, France. She died in 1875 in Allegheny City, Allegheny, PA. Allegheny City is now the northside of Pittsburgh. She was married to George Philip Lang in 1831 in Strasbourg. Her parents were Leonard Gerst, who died in Pfaffenhoffen in 1830 and Anna Marie Arnold who died in 1828 in Pfaffenhoffen. Catherine Barbe, known as Barbara, had two brothers Christian born about 1798 and George born about 1809. George was a successful beer maker in Allegheny City.
Do you see any connection to your family? Is Gerst a common name in the Alsace?