Thanks very much for the heads-up Faenor! I hadn't seen that post.
There was some discussion about the name on the airplane from the colour photos. It's suggested they might be related to bird names
http://www.ww2color.com/search/webap...mary_key=00765
I thought it said "Jolli". Googling for it I learnt that in 1963 a children's book was written about a duckling named Jolli. Is this a (nick)name for a duckling in German?