According to the rules established by ICANN, Registrars are expected to maintain the accuracy of the domain name owner's contact details in the Whois database. Most Registrars use the details provided by the buyer at the time the Domain was registered.
In case your information does not match the Whois results, you can change this information by getting in touch with your Registrar who will be able to assist you in updating your information. Once this information is updated, the Whois record will also update accordingly. On an erage, it can take 24-24 hours for this change to reflect in the Whois database.