SCIM Notes

Trello only stores the full name of our users. For compatibility reasons, we attempt to include a derived givenName and familyName in responses for users in locales that typically use Western-order names, but these should not be relied upon to be correct.

Filtering by name.givenName, name.familyName, etc. will internally use name.formatted, and so may not give the expected results. If you know that a name is Western-order, you may find a filter such as name.formatted sw "Alice " (note the trailing space) achieves what you need.