Lydia’s busybody social worker, Sofie Duluti, is a minor character with probably the most complex name in the novel. It is first an anagram. I won’t spoil it by openly giving you the solution up front, but I've hidden it right at the bottom of this blog page should you want to check if your solution is right.
It is second a marriage of two disparate concepts, which delivers a whole sense that supports the anagram and what the social worker represents. This happened to be largely serendipitous, because the anagram came first and I then went looking to see what the components might accidentally mean, to make sure there wasn't any conflict with the intended meaning. That serendipity was itself...