I really dislike the name
Tiger Lily, but I suppose
Tilly could work as a nn for the name. I do like
Tilly, but I think of it as an old American name, 1800ish, which is one of the reasons I like it. If used as a nn for
Tiger Lily (which I associate with the horrible rendition of Native Americans in the Disney Film
Peter Pan) I think I would really dislike the name
Tilly from then on.