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Yes you can. You can get any ficticous name that is not too similar to one already in use...
A good resource for Texans looking to start a business is here -
and of course here - http://www.sos.state.tx.us/corp/index.shtml
Your exact question was "in texas can i get a dba in my name? "
Do you see how that reads, can you get a dba? (as a sole proprietor).. I've had that question before.
However, it looks like the resource I gave you did in fact answer your question...
Nonetheless, you need to contact a site administrator to seek a refund. I cannot do it.