Sherden and Horns
During my childhood, "Mr. Claus" left me a warrior Viking set of good old plastic: a sword, a round shield, and a helmet with the "classical Viking horns".
Horns? Well, not so Viking here.
Besides some forgotten Viking ancestors from the Bronze Age - the Viksø helmets found in Denmark in 1942 -, the "Viking" horns were the thing of operas from the 19th century (Der Ring des Nibelungen). A creative art director got inspired by Celtic and Germanic lore for stage impact.
If you want real helmets with horns, move to the warmer waters of the Great Green (the Mediterranean Sea for the ancient Egyptian) and check the Sardinian fashion (Nuragic culture from ~1200 BCE).
The Instagram of the Egyptians still preserves horned helmets on Sherden warriors in Medinet Habu.
The Sherden people were also known as "Shardana" or "Sherdanu". They were first mentioned under Ramesses II (ca. 1278 BCE, Tanis Stele) and described as "unruly" sea raiders that later served the pharaoh as mercenaries.
Two quotes from the book The struggle of the nations - Egypt, Syria, and Assyria from the French Egyptologist Gaston Maspero about the Sherden in Egypt:
The Shardana, who had constituted the body-guard of Ramses II., and whose commanders had under Ramses III., ranked with the great officers of the crown,
A sort of aristocracy of veterans, notably of Shardana or Mashauasha, entirely devoted to arms, grew up and increased gradually side by side with the ancient noble families, now by preference devoted to the priesthood.
The Sherden vanished as a distinct group and with them their horned helmets.
The belief points to their survivors naming and settling the island of Sardinia - there is a sculpture of a warrior with a helmet with broken horns at the Giants of Mont'e Prama in the Italian island.
Still thinking of a Viking helmet?
Look for the Gjermundbu helmet. That's the kind of helmet that you'll get for real.