Index: src/wp-includes/user.php
===================================================================
--- src/wp-includes/user.php	(revision 43381)
+++ src/wp-includes/user.php	(working copy)
@@ -2733,11 +2733,7 @@
 		);
 		update_user_meta( $current_user->ID, '_new_email', $new_user_email );
 
-		if ( is_multisite() ) {
-			$sitename = get_site_option( 'site_name' );
-		} else {
-			$sitename = get_option( 'blogname' );
-		}
+		$sitename = get_option( 'blogname' );
 
 		/* translators: Do not translate USERNAME, ADMIN_URL, EMAIL, SITENAME, SITEURL: those are placeholders. */
 		$email_text = __(
@@ -2785,7 +2781,7 @@
 		$content = str_replace( '###ADMIN_URL###', esc_url( admin_url( 'profile.php?newuseremail=' . $hash ) ), $content );
 		$content = str_replace( '###EMAIL###', $_POST['email'], $content );
 		$content = str_replace( '###SITENAME###', wp_specialchars_decode( $sitename, ENT_QUOTES ), $content );
-		$content = str_replace( '###SITEURL###', network_home_url(), $content );
+		$content = str_replace( '###SITEURL###', home_url(), $content );
 
 		wp_mail( $_POST['email'], sprintf( __( '[%s] New Email Address' ), wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ) ), $content );
 
@@ -3055,12 +3051,12 @@
 	$content = str_replace( '###MANAGE_URL###', esc_url_raw( $email_data['manage_url'] ), $content );
 	$content = str_replace( '###SITEURL###', esc_url_raw( $email_data['siteurl'] ), $content );
 
-	$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
+	$sitename = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
 
 	$subject = sprintf(
 		/* translators: 1: Site name. 2: Name of the confirmed action. */
 		__( '[%1$s] Action Confirmed: %2$s' ),
-		$blogname,
+		$sitename,
 		$action_description
 	);
 
@@ -3070,7 +3066,7 @@
 	 * @since 4.9.7
 	 *
 	 * @param string $subject    The email subject.
-	 * @param string $blogname   The name of the site.
+	 * @param string $sitename   The name of the site.
 	 * @param array  $email_data {
 	 *     Data relating to the account action email.
 	 *
@@ -3083,7 +3079,7 @@
 	 *     @type string          $admin_email The administrator email receiving the mail.
 	 * }
 	 */
-	$subject = apply_filters( 'user_request_confirmed_email_subject', $subject, $blogname, $email_data );
+	$subject = apply_filters( 'user_request_confirmed_email_subject', $subject, $sitename, $email_data );
 
 	$email_sent = wp_mail( $email_data['admin_email'], $subject, $content );
 
@@ -3360,8 +3356,8 @@
 			'request_id'  => $request_id,
 			'confirm_key' => wp_generate_user_request_key( $request_id ),
 		), wp_login_url() ),
-		'sitename'    => is_multisite() ? get_site_option( 'site_name' ) : get_option( 'blogname' ),
-		'siteurl'     => network_home_url(),
+		'sitename'    => get_option( 'blogname' ),
+		'siteurl'     => home_url(),
 	);
 
 	/* translators: Do not translate DESCRIPTION, CONFIRM_URL, SITENAME, SITEURL: those are placeholders. */
@@ -3415,10 +3411,10 @@
 	$content = str_replace( '###SITENAME###', wp_specialchars_decode( $email_data['sitename'], ENT_QUOTES ), $content );
 	$content = str_replace( '###SITEURL###', esc_url_raw( $email_data['siteurl'] ), $content );
 
-	$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
+	$sitename = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
 
 	/* translators: Privacy data request subject. 1: Site name, 2: Name of the action */
-	$subject = sprintf( __( '[%1$s] Confirm Action: %2$s' ), $blogname, $email_data['description'] );
+	$subject = sprintf( __( '[%1$s] Confirm Action: %2$s' ), $sitename, $email_data['description'] );
 
 	/**
 	 * Filters the subject of the email sent when an account action is attempted.
@@ -3426,7 +3422,7 @@
 	 * @since 4.9.6
 	 *
 	 * @param string $subject    The email subject.
-	 * @param string $blogname   The name of the site.
+	 * @param string $sitename   The name of the site.
 	 * @param array  $email_data {
 	 *     Data relating to the account action email.
 	 *
@@ -3438,7 +3434,7 @@
 	 *     @type string          $siteurl     The site URL sending the mail.
 	 * }
 	 */
-	$subject = apply_filters( 'user_request_action_email_subject', $subject, $blogname, $email_data );
+	$subject = apply_filters( 'user_request_action_email_subject', $subject, $sitename, $email_data );
 
 	return wp_mail( $email_data['email'], $subject, $content );
 }