LookupAccountName

[DllImport("Advapi32.dll", SetLastError = true)][return: MarshalAs(UnmanagedType.Bool)]
public static extern bool LookupAccountName(
   string lpSystemName,
   string lpAccountName,
   IntPtr Sid,
   ref uint cbSid,
   StringBuilder ReferencedDomainName,
   ref uint cchReferencedDomainName,
   out SID_NAME_USE peUse
);

Microsoft documentation: Link