Family name Lwyn (Lwyn 
, Loyne 
, Lumbus 
) , worldwide, is quite a rare last name. The family name Lwyn is characteristic of Myanmar, where it is a rare surname, Indonesia, and Australia. Not in comparison with a country's population, it is the most numerous in Indonesia, Myanmar, and the United States. Much less frequently, Lwyn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lwyn | Indonesia, Myanmar, Morocco, Singapore, United States |
| Loyne | Philippines, United Kingdom, Israel, Brazil, United States |
| Lumbus | Philippines, United Kingdom, Australia, India, United States |
| Loigne | France |