Siegfried is a German-language male given name, composed from the Germanic elements sig "victory" and frithu "protection, peace".
The German name has the Old Norse cognate Sigfriðr, Sigfrøðr, which gives rise to Swedish Sigfrid (hypocorisms Sigge, Siffer), Danish/Norwegian Sigfred. In Norway, Sigfrid is given as a feminine name.
The name is medieval and was borne by the legendary dragon-slayer also known as Sigurd. It did survive in marginal use into the modern period, but after 1876 it enjoyed renewed popularity due to Wagner's Siegfried.
Notable people with the name include:
Medieval
Siegfried, Count of Merseburg (died 937)
Siegfried I the Older, Count of Walbeck (died 990)
Sigfried, Count of the Ardennes (c. 922–998), founder of Luxembourg
Siegfried I, Count of Stade (before 929–after 961)
Siegfried (bishop of Piacenza) (died 1031)
Siegfried II, Count of Stade (c. 956–1037)
Sigfrid of Sweden (died 1045), English missionary to Sweden and patron saint of Växjö
Siegfried I, Count of Sponheim (c. 1010–1065)
Siegfried I (archbishop of Mainz) (died 1084)
Siegfried of Ballenstedt (c. 1075–1113)
Siegfried IV, Count of Northeim-Boyneburg and Homburg (fl. 12th century)
Siegfried (archbishop of Bremen) (1132–1184)
Siegfried III, Count of Weimar-Orlamünde (c. 1155 – 1206)
Siegfried II (archbishop of Mainz) (died 1230)
Siegfried III (archbishop of Mainz) (died 1249)
Siegfried I, Prince of Anhalt-Zerbst (c. 1230 – 1298)
Siegfried II of Westerburg (before 1260–1297)
Siegfried II of Querfurt (died 1310)
Siegfried von Feuchtwangen (died 1311), 15th Grand Master of the Teutonic Knights
Sigfrid of Pannonhalma (died 1365), Hungarian abbot
Modern
Siegfried Lipiner (1856–1911), Austrian poet and author
Siegfried Wagner (1869–1930), German composer, conductor, and opera director, son of Richard Wagner