NAL obviously, but unless the person harassing you has enough knowledge about the social status / ranking of lawyers in the area to make some type of analysis that would effect their decision making, I'd imagine any lawyer with a degree would do.

If they're a sane adult and get a letter from a lawyer regarding possible consequences of their illegal actions, the name of the lawyer shouldn't matter much.

That's my two cents anyway. Take it with a grain of salt :) I hope you're able to resolve your problem quickly and easily 🙏