If your passport does not show a surname and only lists a given name, you should enter your name for the UK ETA application exactly as it appears in English on your passport.
Do not change, shorten, or rearrange your name. It is important that the name information matches your passport exactly.
If the form requires separate surname and given name fields, follow the instructions shown during the application process. If your name information does not match your passport, it may cause delays or travel issues.
For a smooth trip, check the English name on your passport carefully before applying, and apply for your UK ETA before departure.