Count: 0 — No Latin boy names that start with X meet the criteria. Classical Latin contains virtually no native male personal names beginning with X; the letter appears mainly in Greek loanwords and inside names such as Maximus. Interesting detail: most familiar X‑initial names (Xavier, Xerxes, Xenophon) enter Latin as borrowings or later medieval creations rather than as original Roman praenomina or nomina.

Note that authoritative sources show this absence. Consult classical Latin dictionaries, lists of Roman praenomina and nomina, the Corpus Inscriptionum Latinarum, and standard references such as the Oxford Classical Dictionary; none record native Roman male names that begin with X. Latin writes the Greek letter Ξ as X and uses X for the /ks/ sound, so initial X typically signals a Greek or foreign origin rather than an indigenous Latin name. Roman naming habits and the surviving inscriptions make this pattern clear.

Consider close matches only if you relax the “native Latin” rule. Latinized Greek or foreign names attested in Latin texts include Xenophon, Xanthus, and Xerxes, and medieval or modern names like Xavier enter the Latin tradition via other languages or saints. Alternatively, examine Latin names that contain X (Maximus, Felix) or explore Greek names beginning with Ξ if you seek the X sound. For verifiable lists, prioritize classical dictionaries and the Corpus Inscriptionum Latinarum when building any authoritative A–Z of Latin names.