https://tex.stackexchange.com/a/599435/35864

boldmultiname.tex

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[backend=biber,style=numeric]{biblatex}

\makeatletter
\def\nhblx@bibfile@name{\jobname -nhblx.bib}
\newwrite\nhblx@bibfile
\immediate\openout\nhblx@bibfile=\nhblx@bibfile@name

\immediate\write\nhblx@bibfile{%
  @comment{Auto-generated file}\blx@nl}

\newcounter{nhblx@name}
\setcounter{nhblx@name}{0}

\newcommand*{\nhblx@writenametobib}[1]{%
  \stepcounter{nhblx@name}%
  \edef\nhblx@tmp@nocite{%
    \noexpand\AfterPreamble{%
      \noexpand\setbox0\noexpand\vbox{%
        \noexpand\nhblx@getmethehash{nhblx@name@\the\value{nhblx@name}}}}%
  }%
  \nhblx@tmp@nocite
  \immediate\write\nhblx@bibfile{%
    @misc{nhblx@name@\the\value{nhblx@name}, author = {\unexpanded{#1}}, %
          options = {dataonly=true},}%
  }%
}

\AtEndDocument{%
  \closeout\nhblx@bibfile}

\addbibresource{\nhblx@bibfile@name}

\newcommand*{\nhblx@boldhashes}{}
\DeclareNameFormat{nhblx@hashextract}{%
  \xifinlist{\thefield{hash}}{\nhblx@boldhashes}
    {}
    {\listxadd{\nhblx@boldhashes}{\thefield{hash}}}}

\DeclareCiteCommand{\nhblx@getmethehash}
  {}
  {\printnames[nhblx@hashextract][1-999]{author}}
  {}
  {}

\newcommand*{\addboldnames}{\forcsvlist\nhblx@writenametobib}
\newcommand*{\resetboldnames}{\def\nhblx@boldhashes{}}

\newcommand*{\mkboldifhashinlist}[1]{%
  \xifinlist{\thefield{hash}}{\nhblx@boldhashes}
    {\mkbibbold{#1}}
    {#1}}
\makeatother

\DeclareNameWrapperFormat{boldifhashinlist}{%
  \renewcommand*{\mkbibcompletename}{\mkboldifhashinlist}%
  #1}

\DeclareNameWrapperAlias{sortname}{default}
\DeclareNameWrapperAlias{default}{boldifhashinlist}

\addboldnames{{My Family Name, MyForname},{My Family Name, M.}}


\begin{filecontents}{\jobname.bib}
@inproceedings{identifier1,
  title      = {Some Awesome Title},
  author     = {My Family Name, MyForname and Author, Another},
  booktitle  = {Some Book about the Future},
  year       = {2042},
  pages      = {1--43},
}
@inproceedings{identifier2,
  title      = {Some So-So Title},
  author     = {Author, Another and My Family Name, M.},
  booktitle  = {An okay Booktitle},
  year       = {2000},
  pages      = {1--100},
}
\end{filecontents}
\addbibresource{\jobname.bib}
\addbibresource{biblatex-examples.bib}

\begin{document}
\fullcite{identifier1}

\fullcite{identifier2}

\fullcite{knuth:ct:a}

\fullcite{vizedom:related}

\resetboldnames\addboldnames{Donald E. Knuth}
\fullcite{knuth:ct:a}

\resetboldnames\addboldnames{Philipp Jaff{\'e}}
\fullcite{jaffe}
\end{document}