Change ownership when owned have space in name?

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http://askubuntu.com – I run into a very stupid problem, trying to migrate files into new xampp server and having hard time until i realised: The installation from package created username with space in it. So now i have username "mysql -" and group "mysql" which control databases and i need to change ownership on 30 database and more than 300 tables in that folder, but the only way i know is manually change one by one folder of database. How can i bulk change ownership of all folders and files via terminal or somehow if user have space in name? (HowTos)