You have a “legal” spelling of your name, likely registered with the government and an airline name. That’s really common. I imagine it’s like that for most of

You have a “legal” spelling of your name, likely registered with the government and an airline name. That’s really common. I imagine it’s like that for most of the world’s population. So for the headline, I’d say, you do what everybody else does and enter what the airline accepts. Your passport might even have the correct airline version printed on it. It’s weird this airline has trouble with spaces in names as every flight I’ve flown with in the last 20 years has asked for first and middle names in the given name field.