Segulius
Could not find Segulium in Logeion dictionaries.
Segulium Proper-name noun: masculine genitive plural, Proper-name noun: masculine accusative singular of Segulius
Segulĭus, ĭī, m. , nom dʼh. : Cic. Fam. 11, 20.
Segu'lius
an artist in gold (aurufex, sic), whose name is found in a Latin inscription (Gruter, p. dcxxxix. 1), in which his full name is D. Seyulius Alexsa (sic). The last word, in this case, as in the names of Aulus and Quintus Alexa [Quintus], is commonly supposed to be an abbreviation of the genitive Alexandri or of Alexas ; but Raoul-Rochette thinks that it is a distinct cognomen. (Lettre à M. Schorn. pp. 125. 401, 2d ed.) [P.S]
Segu'lius La'beo
a friend of Octavianus, B. C. 43, is called by Cicero, " homo nequissimus." (Cic. Fam. 11.20, 21.)