Is a man to be known by the kunya of one of his daughters, or by his eldest son?

Question:
May Allah reward you. In his second-to-last question, he says: If a man has a number of sons and daughters, is it impermissible for him to take the kunya of one of his daughters?

Answer:
The Sunnah is to take the kunya of a male child, saying "Abu So-and-so," and one should choose the eldest of his sons. This is because when a man whose kunya was Abu al-Hakam came to the Prophet (peace and blessings be upon him), the Prophet (peace and blessings be upon him) said, "Indeed, Allah is the Judge, and to Him belongs the judgment." Then he asked, "What are your sons?" He said, "Shurayh, So-and-so, and So-and-so." He asked, "Who is the eldest?" He said, "Shurayh." He said, "Then you are Abu Shurayh." A man takes the kunya of his eldest son. Yes.