my %xref_hash;

for my $dev ( @dev_list ) {
   print STDOUT "looking for $dev\n";
   for my $x ( @xref ) {
      if ( $x =~ /$dev\./i ) {
         my $hkey = "dev_xref_$dev";
         push @{ $xref_hash{ $hkey }}, $x;
      }
   }
}

# to use that data structure:

for my $hkey ( keys %xref_hash )  # (you might want to sort)
{
   print join( "\n  ", "\nvalues for $hkey:", @{$xref_hash{$hkey}} ), "\n";
}