\part{First Fifth}
\index[names]{First}
\index[names]{Fifth}

\chapter{Second}
\index[names]{Second}

\section{Third}
\index[names]{Third}


\clearpage

\subsection{Forth}
\index[names]{Forth}

\subsubsection{Fifth}
\index[names]{Fifth}


\clearpage

\index[names]{First}
\index[names]{Second}
\index[names]{Third}
\index[names]{Forth}
\index[names]{Fifth}
% First Second Third Forth Fifth

Here we go