Try searching for your username on https://namechk.com/ https://namechk.com/ https://www.namecheckr.com/ https://www.namecheckr.com/ http://checkusernames.com/

Try searching for your username on https://namechk.com/ https://namechk.com/ https://www.namecheckr.com/ https://www.namecheckr.com/ http://checkusernames.com/ http://checkusernames.com/ or https://pipl.com https://pipl.com. I am sure these name checkers can't be built if they have to spam the sign up forms just to check availability (at least not for free if they have to pay for manual recaptchas). The privacy is worth it.