documentclass[11pt,letterpaper]{memoir}
usepackage{lipsum}
usepackage{type1cm}
usepackage{lettrine}
setcounter{DefaultLines}{2}
renewcommand{DefaultLoversize}{0.14}
renewcommand{LettrineTextFont}{relax}

begin{document}
    lettrine[]{textbf{D}}{ rop caps }lipsum[1]
end{document}

documentclass[11pt,letterpaper]{memoir}
usepackage{lipsum}
usepackage{type1cm}
usepackage{lettrine}
setcounter{DefaultLines}{2}
renewcommand{DefaultLoversize}{0.14}
renewcommand{LettrineTextFont}{relax}

input RoyalIn.fd
newcommand*initfamily{usefont{U}{RoyalIn}{xl}{n}}

begin{document}
    lettrine[]{textbfinitfamily{D}}{ rop caps }lipsum[1]
end{document}