Select the icons on the filter to find the royal names that include them.
Every time you add a new icon to the filter, the possible icons list will be automatically updated to include only the icons included in the already filtered possible royal names.
If you need to start again, you can click on the "Clear" link.
In order to be more specific, try to filter by non too common icons. Searching by monoconsonantic icons will find too many possible results.
Keep in mind that some icons might be changed with others (i.e. S29 is commonly used in horizontal orientation and O34 is used in vertical orientation, thus both icons were usually interchangeable) and only one of the icons will be used in the name variant. If you don't find any royal name with a set of selected icons, you can try to replace some icons with its equivalencies.