On this example, I use \cref{first,second} and cleveref correctly labels them:
\documentclass[10pt,a5paper]{memoir}
\usepackage[brazil]{babel}
\usepackage{hyperref}
\usepackage{cleveref}
\begin{document}
\namecref{first,second}
\chapter{First}
\label{first}
\chapter{Second}
\label{second}
\end{document}
But, if I use \nameref{first,second}, then, it gives me only ?? instead of First and Second.
How can I use \nameref with multiple labels as \cref?
You can use the following code. Note that user is your current display name; you should probably replace the user prefix in the code with something more likely to be unique in order to be sure not to conflict with other unrelated code that might exist using the same prefix.
% The code below automatically adapts to the selected language.
\documentclass[english]{article}
\usepackage{babel}
\usepackage{xparse}
\usepackage{hyperref}
\usepackage{cleveref}
\ExplSyntaxOn
% #1: variant (cref, Cref, crefs or Crefs)
% #2: reference name (label)
\cs_new_protected:Npn \user_name_cref:nn #1#2
{ \use:c { name #1 } {#2} }
\cs_generate_variant:Nn \user_name_cref:nn { xV }
% #1: boolean expression (true: disable hyperlink)
% #2: reference name (label)
\cs_new_protected:Npn \user_name_ref:nn #1#2
{ \bool_if:nTF {#1} { \nameref* } { \nameref } {#2} }
\cs_generate_variant:Nn \user_name_ref:nn { nV }
\seq_new:N \l__user_name_refs_tmpa_seq
\seq_new:N \l__user_name_refs_tmpb_seq
\int_new:N \l__user_name_refs_nbrefs_int
\tl_new:N \l__user_name_refs_firstref_tl
% #1: boolean expression (true: start with capitalized letter, as in \Cref)
% #2: boolean expression (true: disable hyperlinks)
% #3: comma list of refs
\cs_new_protected:Npn \user_name_refs:nnn #1#2#3
{
\seq_set_from_clist:Nn \l__user_name_refs_tmpa_seq {#3}
\int_set:Nn \l__user_name_refs_nbrefs_int
{ \seq_count:N \l__user_name_refs_tmpa_seq }
\seq_get_left:NN \l__user_name_refs_tmpa_seq \l__user_name_refs_firstref_tl
% (section, Section, sections or Sections) or (theorem, Theorem, ...) or...
\user_name_cref:xV
{ \bool_if:nTF {#1} { C } { c }
ref
\int_compare:nNnTF { \l__user_name_refs_nbrefs_int } > { 1 } { s } { } }
\l__user_name_refs_firstref_tl
\nobreakspace
% Now print the references.
\seq_clear:N \l__user_name_refs_tmpb_seq
\seq_map_inline:Nn \l__user_name_refs_tmpa_seq
{
\seq_put_right:Nn \l__user_name_refs_tmpb_seq
{ \user_name_ref:nn {#2} {##1} }
}
\seq_use:Nnnn \l__user_name_refs_tmpb_seq { \crefpairconjunction }
{ \crefmiddleconjunction } { \creflastconjunction }
}
\cs_generate_variant:Nn \user_name_refs:nnn { nx }
\cs_new_protected:Npn \__user_name_refs:Nnn #1#2#3
{
\user_name_refs:nxn {#1}
{ \IfBooleanTF {#2} { \c_true_bool } { \c_false_bool } }
{#3}
}
% “Start in lower case” variant. With star: disable hyperlinks.
% #2: comma list of refs
\NewDocumentCommand \nameRefs { s m }
{
\__user_name_refs:Nnn \c_false_bool {#1} {#2}
}
% “Start in upper case” variant. With star: disable hyperlinks.
% #2: comma list of refs
\NewDocumentCommand \NameRefs { s m }
{
\__user_name_refs:Nnn \c_true_bool {#1} {#2}
}
\ExplSyntaxOff
\begin{document}
References:
\begin{itemize}
\item With one reference and hyperlink: \nameRefs{first} (we'll disable
hyperlinks from now on, because their default appearance is hideous and they
don't behave very well across line breaks);
\item With one reference: \nameRefs*{first};
\item With two references: \nameRefs*{first, second};
\item With three references: \nameRefs*{first, second, third};
\item With four references: \nameRefs*{first, second, third, fourth};
\item Capitalized variant: \NameRefs*{first, second, third, fourth};
\item etc.
\end{itemize}
% This is a cref command; beware that spaces are not ignored after the commas!
For comparison, the \verb|\cref| command: \cref{first,second,third,fourth}.
\section{First section}
\label{first}
\section{Second section}
\label{second}
\section{Third section}
\label{third}
\section{Fourth section}
\label{fourth}
\end{document}
