I think going with your personal name helps you if for whatever reason you want or need to pivot or change your brand in the future. For example if your username is travelbob or something like that, but you decide to really focus on lifestyle or fashion and stop traveling then you’re in a bit of a bind.
It also depends on how you may want to monetize the account. Using a travel related name may also be limiting with regards to products you may want to advertise. BobSmith can hawk ice cream, alcohol, water bottles, services, hotels…but TravelBob may be limited to hotels and car rental companies.
But if you do use a travel related username, I also suggest keeping it general as to not corner yourself even further. E.G. if you go with BackpackerBob, but then 5 years from now you have sponsors and want to stay for free in the St. Regis Maldives and not a dirty hostel…well a lot of travel institutions will be turned off by the connotation of backpacker in your brand name.
But also if your name is in any way complicated or hard to spell that could work against you.
Or you could do something related to your name that would also keep it short and recognizable like instead of John Smith you could to Jsmth, JohnS, Smithy, JohnnyS, Josm, etc etc etc.
Seems like in Instagram, the shorter the better.
But if you do use your personal name, I would make sure you do something Travel related in the name field just at first while growing to be sure people know what you’re about.
I chose a really general yet niche related name for my account, but I used my nickname instead of my real name. Now as it is growing I sort of regret doing that and am slowly deciding whether or now I may change it. But changing a username is a whole other ordeal and I feel a bit trapped in my silly nickname.
Good luck with your project!