Ruth 2:6

And the servant that was set over the reapers answered and
said
Who had taken a great deal of notice of Ruth, and had conversed with her, and so was capable of giving answers to his master's question:

it is the Moabitish damsel that came back with Naomi, out of the
country of Moab;
perhaps he had not got knowledge of her name, and therefore only describes her by the country from whence she came; and by her coming from thence along with Naomi, when she returned from Moab, with whose name Boaz was well acquainted, and of whose return he had been informed; and perhaps had seen her in person, and even Ruth also, though he might have forgot her; the Targum makes the servant to add, that she was become a proselytess.