New Revised Standard Version
The eunuch asked Philip, “About whom, may I ask you, does the prophet say this, about himself or about someone else?”

Contemporary English Version
The official said to Philip, "Tell me, was the prophet talking about himself or about someone else?"

New American Bible
Then the eunuch said to Philip in reply, “I beg you, about whom is the prophet saying this? About himself, or about someone else?”

Douay-Rheims Bible
And the eunuch answering Philip, said: I beseech thee, of whom doth the prophet speak this? Of himself, or of some other man?

And the eunuch answering Philip, said: I beseech thee, of whom doth the prophet speak this? Of himself, or of some other man?

of whom.

Matthew 2:2-4 Saying: Where is he that is born king of the Jews? For we have seen his star in the East, and are come to adore him. . . .

Matthew 13:36 Then having sent away the multitudes, he came into the house, and his disciples came to him, saying: Expound to us the parable of the cockle of the field.

Matthew 15:15 And Peter answering, said to him: Expound to us this parable.