ulsklyc/yuvomi v1.38.0 on GitHub

Contacts keep the structured name components of a vCard (given, family, additional, prefix, suffix) instead of only the combined FN string. CardDAV sources format that string however they like — Given Family on one server, Family, Given on the next, sometimes with a title mixed in — which made the list read and sort differently depending on where a contact came from. The display name is now composed as First [Middle] Last from the components, and the list sorts by last name. FN remains the fallback for cards whose N carries no name parts, such as organisation entries.
The contact dialog has separate fields for first and last name, grouped under one required marker: at least one of them must be filled. A contact that has no components yet is pre-filled by splitting its display name at the last word, and that guess is only saved once a name field is actually edited — so changing a phone number never invents a surname for a company contact.
The vCard export writes real N components where they exist, and the import reads them, so a contact exported from Yuvomi and read back elsewhere keeps its name structure.

Existing CardDAV contacts are picked up on the next sync: contacts created purely from a vCard also get their display name normalised once, while contacts that were adopted from a local entry keep the name the household gave them.
The duplicate check during vCard import compares both name orders and the comma form, so re-importing a contact that is already synced under Family, Given is recognised instead of silently offered as new.

Editing a contact whose category is not in the managed list no longer moves it to a different category. The dropdown had no matching entry, silently displayed the first category and wrote it on save; the contact's actual category is now offered as its own option and left untouched unless it is changed deliberately.
Family and shared-expense guest contacts drop stale name components when the member's display name changes, so the list no longer sorts them under a surname that is no longer part of their name.