Today, when all the former princely states are no more, the royal coat of arms has its importance only to the royal family and people serving under them. Most of the people in the Rajasthan are taking these insignias as their clan symbol, which shows there lack of knowledge about their own history. These coat of arms were created during the British rule. Before Britishers, these symbols have no existence and royal families were having their ancient clan symbols ( such as Sun of Mewar). All the state records, patta (order of allotment of land) were having these symbols or the signature of the ruler or the issuing authority.
When British came, all the princely states signed treaty with them, allowing their armies to be used in the British interest whenever Britishers wanted. Britishers found it difficult to distinguish between the records of different states as the signs were not able to distinguish the state they belongs to. Also, it was difficult to distinguish between the armies of the different states. Thus, an idea from the Britishers is introduced of having Coat of Arms (as in England and Europe) for each princely state. Thus, modern Coat of Arms came into existence. In a short period of time, they also continued to be changed until the ruler was satisfied with them. Such as, Coat of Arms of Jodhpur, the lion above the symbol was not there at the beginning. At first, there was a Sun in the middle of the shield (see (i don't remember the name for sure) Marwar Rajgharane ki Sanskritik Paramparayen, by Dr. Mahendra Singh Nagar), then it was replaced with an eagle. Then Sun found its place on above the sheild, then sometime later it was replaced by the lion.
All in the brief, it was just to signify the Royal family of the Jodhpur or in other words the State of Marwar. Similarly until 19th century, Sun with a katar was the only symbol signifying Mewar. After British rule, the modern symbol came into existance. These symbols are only signifying the Royal Head or the State, not the clan to which the ruler belongs. This fact has been undermined by the people as they have an feeling of proud to use that symbol ( as if they are Head of the state) which originally was to signify the State just to differentiate between the different princely states.
There were over 500 princely states, when India became independent. Many of states were having rulers of same clan. If the clan is same (in case of Kishangarh, Jodhpur, Ratlam, Bikaner ), then symbol (in respect of the clan) should be the same, which cannot be in practical. Because if this was the case, all the states of similar clans can be taken mistakenly as one state.
People must do hardwork to find the symbol realting to their clan, instead of making their Thikana as the State, the way in which most of the people think.