%%
%% The LaTeX Companion, 3ed
%%
%% Example 16-7-41 on page II-568 in "Changing format directives".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{111.0pt}
%
  \setlength\parindent{0pt}
%  Use biber program

%StartShownPreambleCommands
\usepackage[giveninits]{biblatex}
\addbibresource{tlc.bib}
\DeclareNameAlias{mynameformat}{family-given}
%StopShownPreambleCommands

\begin{document}
\citename{LGC97}[mynameformat]{author}               \\
\citename{LGC97}[family-given/given-family]{author}
\end{document}