edit: although to be fair, in the context of an article written in English aimed at a general audience this is not an easy situation. Properly using just the first name might throw off people who don't know about the Icelandic conventions (that would be most of them) who might then consider this use as strangely personal. On the other hand, repeatedly using the full name might look weird too. Personally I'm not convinced these are worth the trade-off of being culturally incorrect, but I'm not the one making the calls.