Deuterotheme is a term widely used in onomastics, referring to the second element in a given personal or place name. Often, this element carries significant meaning or conveys additional information about the individual or location. However, it is worth noting that there aren't many direct synonyms for the term "deuterotheme". One could use the phrase "second element" as a substitute, but it lacks the specificity and nuance of deuterotheme. Alternatively, one may opt to describe it as the "secondary component" or "subsequent part" of the name. Overall, while synonyms for deuterotheme may be limited, these expressions can help convey the notion effectively.