diff --git a/lib/sequencer/unit/import/common/object_attribute/sanitized_name.rb b/lib/sequencer/unit/import/common/object_attribute/sanitized_name.rb
index 33adf8802..de0c5829f 100644
--- a/lib/sequencer/unit/import/common/object_attribute/sanitized_name.rb
+++ b/lib/sequencer/unit/import/common/object_attribute/sanitized_name.rb
@@ -13,6 +13,8 @@ class Sequencer
               # model_name
               # model_name
               # model_name
+              # model_name_
+              # model_name
               without_double_underscores.gsub(/_id(s?)$/, '_no\1')
             end
 
@@ -22,16 +24,31 @@ class Sequencer
               # model_name
               # model_name
               # model_name
-              without_spaces_and_slashes.gsub(/_{2,}/, '_')
+              # model_name_
+              # model_name
+              only_supported_chars.gsub(/_{2,}/, '_')
             end
 
-            def without_spaces_and_slashes
+            def only_supported_chars
               # model_id
               # model_ids
               # model___name
               # model_name
+              # model__name
+              # model_name_
               # model_name
-              transliterated.gsub(%r{[\s/]}, '_').underscore
+              downcased.split('').map { |char| char.match?(/[a-z0-9_]/) ? char : '_' }.join
+            end
+
+            def downcased
+              # model id
+              # model ids
+              # model / name
+              # model name
+              # model::name
+              # model name?
+              # model name
+              transliterated.downcase
             end
 
             def transliterated
@@ -39,6 +56,8 @@ class Sequencer
               # Model IDs
               # Model / Name
               # Model Name
+              # Model::Name
+              # Model Name?
               # Model Name
               ::ActiveSupport::Inflector.transliterate(unsanitized_name, '_'.freeze)
             end
@@ -48,6 +67,8 @@ class Sequencer
               # Model IDs
               # Model / Name
               # Model Name
+              # Model::Name
+              # Model Name?
               # rubocop:disable Style/AsciiComments
               # Mödel Nâmé
               # rubocop:enable Style/AsciiComments
diff --git a/lib/sequencer/unit/import/zendesk/object_attribute/sanitized_name.rb b/lib/sequencer/unit/import/zendesk/object_attribute/sanitized_name.rb
index cfc9f10a9..6d19b831a 100644
--- a/lib/sequencer/unit/import/zendesk/object_attribute/sanitized_name.rb
+++ b/lib/sequencer/unit/import/zendesk/object_attribute/sanitized_name.rb
@@ -14,6 +14,8 @@ class Sequencer
               # Model IDs
               # Model / Name
               # Model Name
+              # Model Name?
+              # Model::Name
               resource['key']
             end
           end
diff --git a/lib/sequencer/unit/import/zendesk/ticket_field/sanitized_name.rb b/lib/sequencer/unit/import/zendesk/ticket_field/sanitized_name.rb
index e35ba2ce9..10b5595c4 100644
--- a/lib/sequencer/unit/import/zendesk/ticket_field/sanitized_name.rb
+++ b/lib/sequencer/unit/import/zendesk/ticket_field/sanitized_name.rb
@@ -17,6 +17,8 @@ class Sequencer
               # Model IDs
               # Model / Name
               # Model Name
+              # Model Name?
+              # Model::Name
               resource.title
             end
           end
diff --git a/spec/lib/sequencer/unit/import/common/object_attribute/sanitized_name_spec.rb b/spec/lib/sequencer/unit/import/common/object_attribute/sanitized_name_spec.rb
index 4fc7cba27..5a1158cb5 100644
--- a/spec/lib/sequencer/unit/import/common/object_attribute/sanitized_name_spec.rb
+++ b/spec/lib/sequencer/unit/import/common/object_attribute/sanitized_name_spec.rb
@@ -48,7 +48,23 @@ RSpec.describe Sequencer::Unit::Import::Common::ObjectAttribute::SanitizedName,
         allow(instance).to receive(:unsanitized_name).and_return('Ærøskøbing Ät Mödél')
       end
 
-      expect(provided[:sanitized_name]).to eq('a_eroskobing_at_model')
+      expect(provided[:sanitized_name]).to eq('aeroskobing_at_model')
+    end
+
+    it 'replaces questionmark characters' do
+      provided = process do |instance|
+        allow(instance).to receive(:unsanitized_name).and_return('model?')
+      end
+
+      expect(provided[:sanitized_name]).to eq('model_')
+    end
+
+    it 'replaces colon characters' do
+      provided = process do |instance|
+        allow(instance).to receive(:unsanitized_name).and_return('mo::del')
+      end
+
+      expect(provided[:sanitized_name]).to eq('mo_del')
     end
   end
 end
diff --git a/test/integration/zendesk_import_test.rb b/test/integration/zendesk_import_test.rb
index 55c1afa54..c2418d758 100644
--- a/test/integration/zendesk_import_test.rb
+++ b/test/integration/zendesk_import_test.rb
@@ -340,7 +340,7 @@ class ZendeskImportTest < ActiveSupport::TestCase
           organization_id:          2,
           test_checkbox:            true,
           custom_integer:           999,
-          custom_drop_down:         'key2',
+          custom_dropdown:          'key2',
           custom_decimal:           '1.6',
           not_existing:             nil,
         },
@@ -361,7 +361,7 @@ class ZendeskImportTest < ActiveSupport::TestCase
           organization_id:          nil,
           test_checkbox:            false,
           custom_integer:           nil,
-          custom_drop_down:         '',
+          custom_dropdown:          '',
           custom_decimal:           nil,
           not_existing:             nil,
         },
@@ -538,7 +538,7 @@ class ZendeskImportTest < ActiveSupport::TestCase
       custom_date
       custom_integer
       custom_regex
-      custom_drop_down
+      custom_dropdown
     ]
 
     assert_equal(copmare_fields, local_fields, 'ticket fields')