diff --git a/server/api/register.go b/server/api/register.go
index 77a4df1..88b5312 100644
--- a/server/api/register.go
+++ b/server/api/register.go
@@ -77,7 +77,7 @@ func Register(username, newPassword, confirmPassword string) *RegisterProps {
 
 	existingUser, _ := db.GetUserByName(username)
 	if existingUser != nil {
-		log.Printf("Username is taken: %q\n", username)
+		log.Printf("Username is taken: %q\n", existingUser.NormalName)
 		props.Username.Error = "Username is taken"
 		return props
 	}
diff --git a/server/db/group.go b/server/db/group.go
index 5b1efdc..9ba69d3 100644
--- a/server/db/group.go
+++ b/server/db/group.go
@@ -3,6 +3,7 @@ package db
 import (
 	"database/sql"
 	"fmt"
+	"lishwist/normalize"
 	"strconv"
 )
 
@@ -66,7 +67,7 @@ func queryForGroups(query string, args ...any) ([]Group, error) {
 }
 
 func queryForGroupMembers(groupId string) ([]User, error) {
-	query := "SELECT user.id, user.name, user.reference, user.is_admin, user.is_live FROM v_user AS user JOIN group_member ON group_member.user_id = user.id JOIN [group] ON [group].id = group_member.group_id WHERE [group].id = ? ORDER BY group_member.user_id"
+	query := "SELECT user.id, user.name, user.display_name, user.reference, user.is_admin, user.is_live FROM v_user AS user JOIN group_member ON group_member.user_id = user.id JOIN [group] ON [group].id = group_member.group_id WHERE [group].id = ? ORDER BY group_member.user_id"
 	members, err := queryForUsers(query, groupId)
 	if err != nil {
 		return members, fmt.Errorf("Failed to get members: %w", err)
@@ -85,6 +86,7 @@ func GetAllGroups() ([]Group, error) {
 }
 
 func CreateGroup(name string, reference string) (*Group, error) {
+	name = normalize.Name(name)
 	stmt := "INSERT INTO [group] (name, reference) VALUES (?, ?)"
 	result, err := database.Exec(stmt, name, reference)
 	if err != nil {
diff --git a/server/db/init.sql b/server/db/init.sql
index 5f1aeff..2780036 100644
--- a/server/db/init.sql
+++ b/server/db/init.sql
@@ -2,6 +2,7 @@ BEGIN TRANSACTION;
 CREATE TABLE IF NOT EXISTS "user" (
 	"id"	INTEGER NOT NULL UNIQUE,
 	"name"	TEXT NOT NULL UNIQUE,
+	"display_name"	TEXT NOT NULL UNIQUE,
 	"reference"	TEXT NOT NULL UNIQUE,
 	"motto"	TEXT NOT NULL DEFAULT "",
 	"password_hash"	TEXT NOT NULL,
diff --git a/server/db/user.go b/server/db/user.go
index 79975f9..ea40c88 100644
--- a/server/db/user.go
+++ b/server/db/user.go
@@ -3,16 +3,18 @@ package db
 import (
 	"database/sql"
 	"fmt"
+	"lishwist/normalize"
 
 	"github.com/google/uuid"
 )
 
 type User struct {
-	Id        string
-	Name      string
-	Reference string
-	IsAdmin   bool
-	IsLive    bool
+	Id         string
+	NormalName string
+	Name       string
+	Reference  string
+	IsAdmin    bool
+	IsLive     bool
 }
 
 type Gift struct {
@@ -30,7 +32,7 @@ type Gift struct {
 
 func queryForUser(query string, args ...any) (*User, error) {
 	var u User
-	err := database.QueryRow(query, args...).Scan(&u.Id, &u.Name, &u.Reference, &u.IsAdmin, &u.IsLive)
+	err := database.QueryRow(query, args...).Scan(&u.Id, &u.NormalName, &u.Name, &u.Reference, &u.IsAdmin, &u.IsLive)
 	if err == sql.ErrNoRows {
 		return nil, nil
 	} else if err != nil {
@@ -48,7 +50,7 @@ func queryForUsers(query string, args ...any) ([]User, error) {
 	users := []User{}
 	for rows.Next() {
 		var u User
-		err = rows.Scan(&u.Id, &u.Name, &u.Reference, &u.IsAdmin, &u.IsLive)
+		err = rows.Scan(&u.Id, &u.NormalName, &u.Name, &u.Reference, &u.IsAdmin, &u.IsLive)
 		if err != nil {
 			return nil, err
 		}
@@ -62,27 +64,28 @@ func queryForUsers(query string, args ...any) ([]User, error) {
 }
 
 func GetAllUsers() ([]User, error) {
-	stmt := "SELECT id, name, reference, is_admin, is_live FROM user"
+	stmt := "SELECT id, name, display_name, reference, is_admin, is_live FROM user"
 	return queryForUsers(stmt)
 }
 
 func GetUser(id string) (*User, error) {
-	stmt := "SELECT id, name, reference, is_admin, is_live FROM v_user WHERE id = ?"
+	stmt := "SELECT id, name, display_name, reference, is_admin, is_live FROM v_user WHERE id = ?"
 	return queryForUser(stmt, id)
 }
 
 func GetUserByName(username string) (*User, error) {
-	stmt := "SELECT id, name, reference, is_admin, is_live FROM v_user WHERE name = ?"
+	username = normalize.Name(username)
+	stmt := "SELECT id, name, display_name, reference, is_admin, is_live FROM v_user WHERE name = ?"
 	return queryForUser(stmt, username)
 }
 
 func GetUserByReference(reference string) (*User, error) {
-	stmt := "SELECT id, name, reference, is_admin, is_live FROM v_user WHERE reference = ?"
+	stmt := "SELECT id, name, display_name, reference, is_admin, is_live FROM v_user WHERE reference = ?"
 	return queryForUser(stmt, reference)
 }
 
 func GetAnyUserByReference(reference string) (*User, error) {
-	stmt := "SELECT id, name, reference, is_admin, is_live FROM user WHERE reference = ?"
+	stmt := "SELECT id, name, display_name, reference, is_admin, is_live FROM user WHERE reference = ?"
 	return queryForUser(stmt, reference)
 }
 
@@ -96,13 +99,14 @@ func (u *User) SetLive(setting bool) error {
 	return err
 }
 
-func CreateUser(username string, passHash []byte) (*User, error) {
-	stmt := "INSERT INTO user (name, reference, password_hash) VALUES (?, ?, ?)"
+func CreateUser(name string, passHash []byte) (*User, error) {
+	username := normalize.Name(name)
+	stmt := "INSERT INTO user (name, display_name, reference, password_hash) VALUES (?, ?, ?, ?)"
 	reference, err := uuid.NewRandom()
 	if err != nil {
 		return nil, err
 	}
-	result, err := database.Exec(stmt, username, reference, passHash)
+	result, err := database.Exec(stmt, username, name, reference, passHash)
 	if err != nil {
 		return nil, err
 	}
@@ -112,7 +116,7 @@ func CreateUser(username string, passHash []byte) (*User, error) {
 	}
 	user := User{
 		Id:   fmt.Sprintf("%d", id),
-		Name: username,
+		Name: name,
 	}
 	return &user, nil
 }
diff --git a/server/normalize/name.go b/server/normalize/name.go
new file mode 100644
index 0000000..ccd8574
--- /dev/null
+++ b/server/normalize/name.go
@@ -0,0 +1,14 @@
+package normalize
+
+import (
+	"strings"
+)
+
+func Trim(s string) string {
+	return strings.Trim(s, " \t")
+}
+
+func Name(name string) string {
+	name = Trim(name)
+	return strings.ToLower(name)
+}