Elmo — Originally a short form of Germanic names that began with the element helm meaning "helmet, protection". It is also a derivative of Erasmus, via the old Italian diminutive Ermo. Saint Elmo, also known as Saint Erasmus, was a 4th-century martyr who is the patron of sailors. Saint Elmo's fire is said to be a sign of his protection.
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Names related to Elmo through nicknames, language, or historical forms.