changed their name as they think it can make life easier while they are here.
I'll go and ask Stanley Smith, Myfanwy Griffiths and Malcolm McGowan.
edit: A few phone calls later, I still can't work out why they changed their names to Jarek, Marek and Dobromira.
There has already been a serious answer above. Try this thread:
https://polishforums.com/archives/2005-2009/life/legally-changing-name-english-one-17548/There had been another one I can't find using the search function.