Still did not like the idea of using the names like dumpling and gyoza. If we use momo, it will be different and also it will be the taste of Nepal but if u use other name which are already established, it means u are copying others. By using name MOMO, u are also advertising your Country!!! which is good for everyone. To be honest, Dumpling is not famous here in UK.
Also, if you are opening resturant, do buffet system once or twice a week. That makes lot of money.