this plugin overrides default wordpress sanitize and add Hebrew characters.
From your WordPress dashboard
- Visit 'Plugins > Add New'
- Search for 'Wordpress Hebrew username'
- Activate Wordpress Hebrew username from your Plugins page.
From
WordPress.org
- Download Wordpress Hebrew username.
- Upload the 'Wordpress Hebrew username' directory to your '/wp-content/plugins/' directory, using your favorite method (ftp, sftp, scp, etc...)
- Activate Wordpress Hebrew username from your Plugins page.