It isn't worth much. I have had some reasonable names like TammySue.com, Gwenne.com, and more. I found that they are almost impossible to sell. It doesn't make any sense. I think I sold TammySue.com to someone here for between $100 or $150 (could have been $80 or $180). But I spent more time trying to sell here and searching Google leads, so it cost me a lot of money. The Gwenne name I likely gave away for $20 after exhausting myself. There is even a site at Gwenne.biz. No interest at all at any price.
You would be surprised how hard it is to almost give somebody something that would be of value to them. If they don't get it, they just don't get it. However, with personal first names like this, even with the extra "T" at the end, as long as there are people in the world who spell it that way, you have a chance to get lucky. I have owned a few five figure first names, too, but those also had other meanings. I pretty much sent emails to every first name holder alive a few years ago when the domain bubble was still blowing up (2005 to 2007), so I had a good understanding of what the prices were. I made good money on the deals I did, but it took a lot of work and tire kicking, and I put up serious money for each. I know a lot of those people who were holding out for ridiculous prices will be going to their graves with those names. They should have taken the life-changing money while they could. Now, because they had crazy offers in the past, they are reluctant to sell now at a lower price, even though the market for those names is not what it was.
I should warn you that the more time you spend on this time the worse you will be. If you account for the time spent correctly, you have to include the time spent here on this thread, the time spent thinking about it, the time spent searching for leads, etc. At the end of the day you are almost a LOCK to be worse off for owning it (if you are honest about the time spent on it). With just a few man hours you are dangerously close to never getting even. The more effort you put into this name the worse off you will be. That is almost guaranteed.