Count: 0 — No well-attested Roman praenomina, nomina, or cognomina begin with the letter Y. The classical Latin alphabet lacks Y as a native letter, and Romans use it mainly for Greek loanwords rendered from the Greek letter upsilon. Surveys of inscriptions (Corpus Inscriptionum Latinarum) and primary Latin literature return no native Roman personal names that start with Y.

This absence reflects orthography and naming practice. The pool of Roman praenomina is small and fixed, and Latin normally uses I or V where modern spellings use Y. A few Greek names that begin with upsilon appear in later Latin texts or in Christian and medieval contexts and are transliterated with Y in modern editions, but these are not native Roman names and are rare in the epigraphic record. Consult lists of Roman names beginning with I or V, or verified Greek-derived names in inscriptions and classical sources, for suitable alternatives.