Column to rowname

Trying to make the first column in the data set below become a rowname:

head(data, 4)

R_Saúde             Ano `Baixo peso` Eutrófico Sobrepeso Obesidade
  <chr>             <dbl>        <dbl>     <dbl>     <dbl>     <dbl>
1 Baixada Litorânea  2018          303       602       453       365
2 Noroeste           2018          370       829       609       515
3 Metropolitana I    2018         2137      4141      3376      3261
4 Norte              2018          325       733       612       474

but whatever I try, I get :

Erro: Column name `R_Saúde` must not be duplicated.

Any suggestion?

Do you want to pivot the data? What do you want it to look like?