Baby Name Rank Estimator
Estimate a name’s share and count from a rank and a matching birth total using a simple illustrative model.
Formula and sources updated · Data sources · 1View algorithm, constants and default inputs (JSON)
About this calculator
A rank alone cannot reveal an exact count: name frequency changes by country, year and gender. This tool applies a generic rank curve to the rank and matching-population birth total you enter. Treat every result as an illustrative model estimate, not official registry data.
Worked example
calculated with the default values below
Popularity rank in the source data 1 · Births in the same population as the rank 3,600,000 · Class size 30 Modeled babies with this name 41,400 · Modeled share of births 1.1500 % · Modeled per 1,000 births 11.500 · Modeled classmates with this name 0.35 · Modeled rarity band Very common
Method and assumptions
p = 1.15 ÷ r^1.09 ÷ 100; N = B × p p is a fractional share (multiply by 100 for percent); per thousand = p × 1000. A rank alone cannot reveal an exact count: name frequency changes by country, year and gender. This tool applies a generic rank curve to the rank and matching-population birth total you enter. Treat every result as an illustrative model estimate, not official registry data. The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
Data sources
The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
Disclaimer
These calculators give general estimates for information and entertainment. Platform algorithms, metrics and definitions change without notice, and none of these results are official figures from the platforms named.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
p = 1.15 ÷ r^1.09 ÷ 100; N = B × p
- r
- Name rank
- p
- Share as a fraction
- B
- Total births
- N
- Estimated babies with the name
p is a fractional share (multiply by 100 for percent); per thousand = p × 1000.
Frequently asked questions
How does the rank model estimate a name count?
It applies the generic curve 1.15 ÷ rank^1.09 percent to the birth total you enter, then scales that share to the class size. For rank 1 and 3.6 million births, it estimates 41,400 babies. Name distributions vary by country, year and gender, so this is not a count from an official registry; use same-population birth totals and treat the result as illustrative.
Which inputs and limits apply to Baby Name Rank Estimator?
Use the units shown beside each field. These are form limits, not recommended settings. Popularity rank in the source data: 1–5,000; Births in the same population as the rank: 1–20,000,000; Class size: 1–200 p = 1.15 ÷ r^1.09 ÷ 100; N = B × p p is a fractional share (multiply by 100 for percent); per thousand = p × 1000. A rank alone cannot reveal an exact count: name frequency changes by country, year and gender. This tool applies a generic rank curve to the rank and matching-population birth total you enter. Treat every result as an illustrative model estimate, not official registry data. The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
What is a complete worked example for Popularity rank in the source data = 1; Births in the same population as the rank = 3,600,000?
Inputs: Popularity rank in the source data = 1; Births in the same population as the rank = 3,600,000; Class size = 30. Calculation: p = 1.15 ÷ r^1.09 ÷ 100; N = B × p. Results: Modeled babies with this name = 41,400; Modeled share of births = 1.1500 %; Modeled per 1,000 births = 11.500; Modeled classmates with this name = 0.35; Modeled rarity band = Very common.