I'm going to show my dive naivety here - I don't know who Hans Haas is (I have heard of Cousteu though
From what I've been told in the past - Lotte (without the I) is of dutch origin.
Lottie (with the I) is an abbreviation of the name Charlotte is of germanic origin and means womanly
There you go, you learn something new every day
BwaHaHaHaHaHa...soon to be playing in a barn somewhere