* Spanish evolved over time: Languages don't spring into existence fully formed. Spanish emerged from Vulgar Latin spoken in the Iberian Peninsula, influenced by other languages and evolving over centuries.
* No single "first speaker": There wasn't one person who woke up one day speaking Spanish. Instead, it developed gradually within communities.
What we can say:
* Early speakers were likely in the Iberian Peninsula: Spanish originated from the Latin spoken by Roman soldiers and settlers in the Iberian Peninsula.
* They likely spoke a variety of dialects: Just like today, people in different regions would have spoken slightly different versions of the evolving language.
* It's impossible to know their exact names or identities: There are no surviving records from that time period.
So, instead of focusing on a single first speaker, it's more helpful to understand that Spanish developed gradually as a result of the interactions and language shifts of many individuals and communities over a long period.