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For a litigation-grade trademark registration we often start with a knockout search. If the mark is a reasonable candidate for registration, budget approximately $955-$1,600. The process takes about a year and once granted, budget around $100 per year to keep a federal trademark in-force with renewals. No attorney can ethically guarantee a trademark will grant. The examination process at the U.S. Patent & Trademark Office (USPTO) is adversarial and even when approved by the trademark examining attorney, every mark must be published for opposition for one month wherein private parties can oppose the registration of a trademark.
You can trademark your first name. The main purpose of a trademark is to identify a source of goods and/or services. Should you choose, you can use your first name to identify the source of your goods or services.
However, your trademark application could still be denied if it is confusingly similar to a preexisting trademark application or registration. You should consult with a trademark attorney to determine whether your name is available for trademark registration.