* Global Data: There's no central database that tracks every person's name worldwide.
* Variations: The name Martin exists in many different languages and cultures, and spellings can vary (e.g., Martín, Maarten, etc.).
* Popularity Fluctuations: Name popularity changes over time, making it difficult to estimate historical trends.
However, you can find some information about name popularity:
* Social Security Administration (USA): You can find data on the popularity of names in the United States at the [SSA website](https://www.ssa.gov/oact/babynames/).
* Other Country Registries: Many countries have similar resources that track birth names.
* Name Databases: Online name databases like Forebears offer global estimates based on various sources.
While you won't find an exact number, these resources can give you a sense of the prevalence of the name Martin in different places and time periods.