Hurray! My first point.
I really found the info in an old journal from 1924.
That motivated me to search my archive again today and there I found a very interesting advertisement of a sales company which has sold the Peka tricycle and solves the mystery of the name perfectly!
"LULAWA" = Handelsgesellschaft für Luft-, Land-, Wasser - Fahrzeug-Zubehör m.b.H.