diff --git a/app/models/comment.rb b/app/models/comment.rb
index eb10fab60..604bcd6f5 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -37,7 +37,7 @@ class Comment < ActiveRecord::Base
     end
 
     def for_creator_name(user_name)
-      where("creator_id = (select _.id from users _ where lower(_.name) = lower(?))", user_name.downcase)
+      where("creator_id = (select _.id from users _ where lower(_.name) = lower(?))", user_name.mb_chars.downcase)
     end
 
     def search(params)
@@ -53,7 +53,7 @@ class Comment < ActiveRecord::Base
       end
 
       if params[:creator_name].present?
-        q = q.for_creator_name(params[:creator_name])
+        q = q.for_creator_name(params[:creator_name].tr(" ", "_"))
       end
 
       if params[:creator_id].present?
diff --git a/app/models/forum_post.rb b/app/models/forum_post.rb
index c0fec63b1..8f2c52043 100644
--- a/app/models/forum_post.rb
+++ b/app/models/forum_post.rb
@@ -22,7 +22,7 @@ class ForumPost < ActiveRecord::Base
     end
 
     def creator_name(name)
-      where("forum_posts.creator_id = (select _.id from users _ where lower(_.name) = ?)", name.downcase)
+      where("forum_posts.creator_id = (select _.id from users _ where lower(_.name) = ?)", name.mb_chars.downcase)
     end
 
     def active
@@ -50,7 +50,7 @@ class ForumPost < ActiveRecord::Base
       end
 
       if params[:creator_name].present?
-        q = q.creator_name(params[:creator_name])
+        q = q.creator_name(params[:creator_name].tr(" ", "_"))
       end
 
       q
diff --git a/app/models/note.rb b/app/models/note.rb
index ec36dde35..7ab277a15 100644
--- a/app/models/note.rb
+++ b/app/models/note.rb
@@ -27,7 +27,7 @@ class Note < ActiveRecord::Base
     end
 
     def creator_name(name)
-      where("creator_id = (select _.id from users _ where lower(_.name) = ?)", name.downcase)
+      where("creator_id = (select _.id from users _ where lower(_.name) = ?)", name.mb_chars.downcase)
     end
 
     def search(params)
@@ -47,7 +47,7 @@ class Note < ActiveRecord::Base
       end
 
       if params[:creator_name].present?
-        q = q.creator_name(params[:creator_name])
+        q = q.creator_name(params[:creator_name].tr(" ", "_"))
       end
 
       if params[:creator_id].present?
diff --git a/app/models/pool.rb b/app/models/pool.rb
index 0770332c6..809367773 100644
--- a/app/models/pool.rb
+++ b/app/models/pool.rb
@@ -35,7 +35,7 @@ class Pool < ActiveRecord::Base
       end
 
       if params[:creator_name].present?
-        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].downcase)
+        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].tr(" ", "_").mb_chars.downcase)
       end
 
       if params[:creator_id].present?
diff --git a/app/models/tag.rb b/app/models/tag.rb
index 9b9f4568c..1ea5cb822 100644
--- a/app/models/tag.rb
+++ b/app/models/tag.rb
@@ -440,7 +440,7 @@ class Tag < ActiveRecord::Base
       params = {} if params.blank?
 
       if params[:name_matches].present?
-        q = q.name_matches(params[:name_matches].strip)
+        q = q.name_matches(params[:name_matches].strip.tr(" ", "_"))
       end
 
       if params[:category].present?
diff --git a/app/models/user.rb b/app/models/user.rb
index cf9fc4e32..9e04de7b9 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -74,7 +74,7 @@ class User < ActiveRecord::Base
     module ClassMethods
       def name_to_id(name)
         Cache.get("uni:#{Cache.sanitize(name)}", 4.hours) do
-          select_value_sql("SELECT id FROM users WHERE lower(name) = ?", name.mb_chars.downcase)
+          select_value_sql("SELECT id FROM users WHERE lower(name) = ?", name.mb_chars.downcase.tr(" ", "_"))
         end
       end
 
@@ -545,11 +545,11 @@ class User < ActiveRecord::Base
       return q if params.blank?
 
       if params[:name].present?
-        q = q.name_matches(params[:name].mb_chars.downcase)
+        q = q.name_matches(params[:name].mb_chars.downcase.tr(" ", "_"))
       end
 
       if params[:name_matches].present?
-        q = q.name_matches(params[:name_matches].mb_chars.downcase)
+        q = q.name_matches(params[:name_matches].mb_chars.downcase.tr(" ", "_"))
       end
 
       if params[:min_level].present?
diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index 886495f24..b991b1dd5 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -42,7 +42,7 @@ class WikiPage < ActiveRecord::Base
       end
 
       if params[:creator_name].present?
-        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].downcase)
+        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].tr(" ", "_").mb_chars.downcase)
       end
 
       if params[:sort] == "time" || params[:sort] == "Date"