A Viking basically means a man from the creek/cove, but it later became synonymous with one that had been on naval expeditions.
There has never been found a single horned helmet from the Viking Age. In fact, there has only been found one helmet that can be said to be of Viking origin, the Gjermundbu helmet:
Horned helmets were used in Scandinavia in the Nordic Bronze Age and early Iron Age for ceremonial and/or ritual purposes:
