The Monaci Family Name
Many Monaci families will find their roots under Monaco, the form most records use. Monaci and Monaco differ only in the final vowel; Italian surnames often appear in both a singular and a plural form. The name is generally explained as “Monk”. Regional accents shaped spellings long before dictionaries fixed them.
The same family of names includes Lo Monaco and Monaca.
A coat of arms belongs to a particular family line rather than to everyone named Monaci, so the heraldry linked to Monaco is a starting point, not an automatic right. Want more than a summary? See the Monaci family name pack.