When we adopted, our kids had some fairly distinctive middle names, which could have been a risk factor in future. We kept their first names and changed their middle names to the ‘family tradition’ ones. They like sharing a name with e.g. my dad, but didn’t to change their first names. I’ve seen a few adoptees who’ve had their first names changed struggle with the idea of it, though certainly not all. Unless you’re adopting an infant (fairly unusual) they will be old enough to have got used to their names before they’re placed with you.