Looking for History Info Connections OR Sommerfeld was the Surnam

Looking for history, info, connections or ? SOMMERFELD was the surname of my great grandfather. Fritz was from a German family that had immigrated to the US in the mid 1800's? Most likely Texas. Fritz was a sailor, either in the navy or on other ships. He came back to the 'old country' either through his work or to visit in about 1910 and then returned to the US. Any info helpful on name history or ? Thanks again, Moka :)