diff --git a/CHANGELOG.md b/CHANGELOG.md
index e8dba40cfd6..30e5b3c4243 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 - Slideout sidebars are now always toggleable; not just when the slideout is too narrow to show the sidebar alongside the content. ([#14418](https://github.com/craftcms/cms/pull/14418))
 - Field Layout Designers now hide the component library sidebar in favor of “Add” disclosure menus, when they’re too narrow to show the sidebar alongside configured tabs. ([#14411](https://github.com/craftcms/cms/pull/14411))
+- Fixed a bug where it wasn’t possible to clear out users’ full names once they were set. ([#14402](https://github.com/craftcms/cms/pull/14402))
 
 ## 5.0.0-beta.2 - 2024-02-15
 
diff --git a/src/elements/User.php b/src/elements/User.php
index 4cbe0c1d1fe..dc51beee694 100644
--- a/src/elements/User.php
+++ b/src/elements/User.php
@@ -973,7 +973,14 @@ public function setAttributes($values, $safeOnly = true): void
             }
         }
 
-        if (array_key_exists('firstName', $values) || array_key_exists('lastName', $values)) {
+        if (array_key_exists('fullName', $values)) {
+            // Clear out the first and last names.
+            // They'll get reset from prepareNamesForSave() if fullName isn't empty.
+            $this->firstName = null;
+            $this->lastName = null;
+        } elseif (array_key_exists('firstName', $values) || array_key_exists('lastName', $values)) {
+            // Clear out the full name.
+            // It'll get reset from prepareNamesForSave() if the first/last names aren't empty.
             $this->fullName = null;
         }