Hello, Yes they have. 

ref:vatin	- is international identification see https://wiki.openstreetmap.org/wiki/Key:ref:vatin and https://en.wikipedia.org/wiki/VAT_identification_number

ref:cz:vatin - is czech identification see (you need use translator) https://cs.wikipedia.org/wiki/Identifika%C4%8Dn%C3%AD_%C4%8D%C3%ADslo_osoby 