Name of lakes and parts of the lake

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Bigger lakes often has alternate names on parts of the lake. How should these (the main name and part names) be mapped and tagged?

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I do feel it’s unfortunate there’s =coastline and =sea / =strait / =bay for seas, but only natural=water + water=lake for lakes. If interpreting literally, natural=water doesn’t have to be a single identifiable feature, but only any arbitrary water area. For comparison, boundary=forest has been voted to be used separately from tree areas on land. (Of course, there’s a small difference in that a lake only includes water area)
type=site could be considered, as the big lake is one lake, only split into different parts for naming. It’s not =cluster / =group , because each part is not one complete lake on its own. Personally, I try to avoid overlapping natural= areas, but it may be accepted for being a perimeter member in the =site for compatibility.
Apparently there was something that looks suitable for this distinction before Tag:natural=lake - OpenStreetMap Wiki
If you would allow me to express some opinion here, this is why landcover= is needed. natural= is a mix of individually identifiable features ( =strait , =bay , etc), and homogeneous statistical classification (=wood etc that landcover= is suitable for; cf landuse= ), not to mention other special cases (=tree , =tree_row). This causes a problem when the natural=water used for both purposes needs to be split for your question.

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I don’t know if it can pass as a role model, but there are a few named parts of the lake on Lake Constance. But as far as I can see, only 2 of 7 names are rendered (because they are tagged as natural=bay. The largest part of the Bodensee called “Obersee” is certainly not a bay. No idea how you could positively influence the rendering here.