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library(tidyverse)
library(babynames)

babynames |>
  filter(
    name == "Josef"
  ) |>
  summarise(
    total = sum(n)
  )

1

Loading packages

2

This will return only the rows of babynames where name == "Josef".

3

This will return a single row data frame where total is the sum of n, which, in this case, is the total number of babies named "Josef" in the data.