Count: 0 — There are no verified classical Latin boy names that start with the letter Y. Understand that the classical Latin alphabet and Roman naming system rarely use the letter Y. Y appears in Latin only as a late import from Greek to represent upsilon, and it mostly appears in Greek loanwords and later medieval spellings rather than in native Roman praenomina, nomina, or cognomina.

Consult authoritative sources such as Lewis & Short, George Davis Chase’s work on Roman praenomina, and the Corpus Inscriptionum Latinarum to confirm that native Roman male names do not begin with Y. Remember that surviving lists of praenomina and nomina from inscriptions and literary texts show no attested Y‑initial personal names in classical Latin, so strict criteria return no results.

Consider close fits and alternatives. Look at Latin names that begin with I (consonantal I pronounced like English “y”), for example Iulius (Julius) or Ianuarius (January), or at medieval Latin spellings of Greek names such as Ysidorus (Isidore), which use Y but are not native classical Latin names. For seekers of a “Y” sound in an authentically Latin context, prioritize I/J‑initial names or Latinized Greek names rather than expecting original Y‑initial Roman names.