Rulers names

I can't figure what's the rule for having rulers' names in coins names.
For example:
Syria and Lebanon have no rulers names at all.
Is there any rule or the info is just missing? thanks!

If there is a portrait, then there is a name. Basically.

This is from the guidlines for editing the catalog:

If the monogram or the portrait of a ruler shows on the coin, give the ruler's name. Separate it from the face value with an hyphen.
The ruler's name should be written in the country's native language. If the country's native language doesn't use latin script, write the English romanization of the name.

Are Lebanon or Syria even monarchies?

Verweis : "Jarcek"​If there is a portrait, then there is a name. Basically.

​Doesnt seem to be the case.
- All UAE coins have ruler name. Only some have portrait.
- Non of Qatar coins have portraits. All have ruler name.
but both are monarchies.
So I guess the rule is there is a name if its a monarchy?

As for Syria, its not a monarchy. And only 2 coins have portrait of the previous president Hafiz Al-Assad.
https://en.numista.com/catalogue/pieces2681.html
https://en.numista.com/catalogue/pieces6972.html

Portrait or name of the ruler as Idolenz said is more precise answer.

Syria and North Korea are hereditary presidencies. Basically absolute monarchies in a modern republican outfit.

The coins of these countries almost never feature their leaders so no need to mention them.

Nauru is an independent republic,therefore,it is wrong to include Queen Elizabeth II's name in the sub-titles.

Nauru became independent within the British Commonwealth in 1968.

Aidan.