Gruhn
Gruhn is a surname of notable people, including:

 George Gruhn (born 1945), American writer, businessman and ophiophilist, specialized on vintage guitars 
 Gruhn Guitars, a musical instrument shop in Nashville, Tennessee
 Josephine Gruhn (1927–2015), American politician
 Wilfried Gruhn (born 1939), German violinist, musicologist, music educator and emeritus professor

Surnames
Surnames from nicknames
German toponymic surnames