Ordnername?

At .NET, the projects are usually structured, consider whether you want to look at it:

/Programm-Name
    /artifacts       Ordner für den Build-Output (optional)
    /build           Build Scripts
    /docs            Dokumentationen (meist Markdown-Dateien) (optional)
    /lib             Assemblies, die **nicht** in NuGet-Paketen verteilt werden können
    /packages        NuGet-Pakete (optional, da diese normalerweise nicht im Projekt selbst abgelegt werden, sondern von einem NuGet Feed kommen)
    /samples         Beispiel-Projekte
    /src             Produkt Quellcode, hier befinden sich die csproj-Dateien der C# Projekte
    /tests           Quellcode für Tests Projekte
    /wiki            Wiki als optionale Alternative für docs/
    .editorconfig    Code Style Definitions
    .gitignore
    .gitattributes
    build.cmd        Build-Script unter Windows (optional)
    build.sh         Build-Script unter *Unix (optional)
    global.json       
    LICENSE
    NuGet.Config   
    README.md
    {Programm-Name}.sln

The program or the project folder is usually called: {Author/Firma}.{Product}

The individual projects in the project folder then carry out this name scheme: {Author/Firma}.{Product}.{shift/module}.{Feature}.{etc.}

You then structure this by layers, modules, features, etc.
And the basic rule applies: The module, which changes more frequently, may be dependent on the modules that change less frequently, not vice versa. This results, for example, in a classic multilayer architecture, e.g.: UI->Business->Data->Data database
And that’s what you call the UI layer called {Author/Firma}.{Product}.{“UI”/”App”/”Presentation”}.{etc.}, the business layer is called {Author/Firma}.{Product}.Business.{etc.} and so on.