R Under development (unstable) (2023-11-25 r85635 ucrt) -- "Unsuffered Consequences"
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> 
> library(nleqslv)
> 
> f <- function(x) {
+     y <-numeric(length(x))
+     y[1] <- x[1]^2 + x[2]^3
+     y[2] <- x[1] + 2*x[2] + 3
+     y
+ }
> 
> # test named x-values
> xstart <- c(a=1.0, b=0.5)
> xstart
  a   b 
1.0 0.5 
> 
> z <- nleqslv(xstart,f, control=list(trace=0))
> all(names(z$x) == names(xstart))
[1] TRUE
> 
> # test named x-values
> xstart <- c(u=1.0, 0.5)
> xstart
  u     
1.0 0.5 
> 
> z <- nleqslv(xstart,f, control=list(trace=0))
> all(names(z$x) == names(xstart))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.18    0.04    0.17