Ubayy ibn Kaʿb, an Ansari of Medina, was one of the scribes of the revelation and the best reciter of the Quran among the Companions (al-Tirmidhi 3790). The Prophet ﷺ told him: “Allah has commanded me to recite Lam yakun (Surah 98) to you”; Ubayy asked: “He named me?” “Yes”, and he wept (al-Bukhari 4959). ʿUmar appointed him to lead the night prayers of Ramadan (al-Bukhari 2010).
Ubayy has the form of the diminutive of ab, “father” (root ʾ-b-w), just as ukhayy is that of akh, “brother”: in Arabic the diminutive expresses smallness or affection. It is an ancient Arabic name, borne before Islam in both Mecca and Medina. It is sometimes confused with abiyy (أَبِيّ), “proud, refusing humiliation”, hence the meaning “one with high self-esteem” sometimes given to it: that is a different word with different vowels.
[Of these stories mention] when Joseph said to his father, "O my father, indeed I have seen [in a dream] eleven stars and the sun and the moon; I saw them prostrating to me."
And strive for Allāh with the striving due to Him. He has chosen you and has not placed upon you in the religion any difficulty. [It is] the religion of your father, Abraham. He [i.e., Allāh] named you "Muslims" before [in former scriptures] and in this [revelation] that the Messenger may be a witness over you and you may be witnesses over the people. So establish prayer and give zakāh and hold fast to Allāh. He is your protector; and excellent is the protector, and excellent is the helper.