diff --git a/app/validators/namespace_validator.rb b/app/validators/namespace_validator.rb
index 77ca033e97f..9601013f2d2 100644
--- a/app/validators/namespace_validator.rb
+++ b/app/validators/namespace_validator.rb
@@ -33,6 +33,22 @@ class NamespaceValidator < ActiveModel::EachValidator
     u
     unsubscribes
     users
+    api
+    autocomplete
+    search
+    member
+    explore
+    uploads
+    import
+    notification_settings
+    abuse_reports
+    invites
+    help
+    koding
+    health_check
+    jwt
+    oauth
+    sent_notifications
   ].freeze
 
   WILDCARD_ROUTES = %w[tree commits wikis new edit create update logs_tree
diff --git a/changelogs/unreleased/30272-bvl-reject-more-namespaces.yml b/changelogs/unreleased/30272-bvl-reject-more-namespaces.yml
new file mode 100644
index 00000000000..56bce084546
--- /dev/null
+++ b/changelogs/unreleased/30272-bvl-reject-more-namespaces.yml
@@ -0,0 +1,4 @@
+---
+title: Improve validation of namespace & project paths
+merge_request: 10413
+author: