It emerges only in the most recent of the books, When Findus was little and disappeared, that the cat had been given to Pettson as a kitten, and that he had arrived in a cardboard box with the text "Findus peas" on the side - hence the inspiration for the choice of a name.
More recently, other children's authors have become notable, such as Maria Gripe, Gunnel Linde, Inger and Lasse Sandberg, Sven Nordqvist with the Pettson and Findus series, Moni Brännström, Anders Jacobsson and Sören Olsson.