Surname Frequency Calculator

No -- this calculator runs a simplified formula from Surname Length, First Letter, Origin Region, and Historical Period rather than looking up any real census or historical naming dataset. Treat Est. Frequency (per 100k) as a rough, illustrative estimate for prioritizing genealogy research, not as a documented historical statistic you could cite.

The model's length factor decreases as Surname Length increases, so shorter names score as more common in this estimate -- reflecting the general real-world tendency for many widespread surnames to be short. It's a heuristic built into the formula, not a measurement of any specific naming tradition or region.

Spelling Variations rises as Surname Length increases because a longer surname simply has more characters where a clerk's transcription, a phonetic respelling, or a translation between languages could introduce a variant spelling across historical records. A short four-letter name has fewer opportunities for that kind of drift than a twelve-letter one.

Historical Period scales the estimate toward more assumed name diversity in the Modern (1800+) era than in Medieval (pre-1500) records, which lowers Est. Frequency and raises the derived Rank Estimate for the same surname. That reflects broader record- keeping and naming variety in more recent history, not a measured count from any specific archive.

No -- Origin Type assigns one default category (Occupational, Patronymic, Locational, Descriptive, or Other) to every surname from a given Origin Region, rather than looking up that specific surname's actual etymology. Many real surnames don't match their region's default: common British occupational surnames like Smith, Baker, Taylor, and Mason all fall under this model's British Isles default of Patronymic even though they're genuinely occupational in origin. Treat Origin Type as a regional generalization, not a verified fact about the name you entered.