Changing the code block to
Code: Select all
\DeclareNameFormat{author}{%
\nameparts{#1}
\small\addfontfeature{Color=lightgray}%
\ifblank{\namepartgiven}{}{\namepartgiven\space}#1%
\ifthenelse{\value{listcount}<\value{liststop}}
{\addcomma\space}
{}%
}