ושם אמו, "and the name of his mother, etc.⁠" Whenever someone displays signs of effrontery and disdain towards the Jewish religion and God it is time to examine his maternal genealogy as it is certain that the droplet of sperm which such an individual grew out of reflected a negative deed or thought at the time when marital relations which produced that baby took place. Unless the Torah wanted to teach us something beyond the meaning of the mere information contained in the text it should have simply written: ויצא בן אשה ישראלית ושמה שלומית בת דברי למטה דן, "the son of an Israelite woman by the name of Shlomit bat Divri from the tribe of Dan went out.⁠" The reason the Torah followed a circuitous route before revealing the name of the blasphemer's mother was that it wanted to keep it secret until after telling us what her son became guilty of. This is why we were first told that he cursed the name of the Lord ((11)). By mentioning her name last, the Torah suggested that the original cause of such a terrible sin being committed was the mother of the sinner who had been guilty of a trespass.
The baby grows out of the mother's blood, is nurtured for the length of the pregnancy by the mother's blood and even after the mother has given birth she nurses the child thus transmitting milk which originally was her blood. As a result of all this it is no more than reasonable that the child absorbs greater genetic input from his mother than from his father. This will eventually be reflected in his deeds which will reflect the mother's character more than that of the father. This is the reason why we find that the prophets who wrote the Books of the prophets, particularly the Books of Kings always made a point of mentioning the name (and sometimes origin) of the king's mother. An interesting example is Kings I 22,42 where the mother of King Yehoshaphat, Azuvah daughter of Shilhi, is mentioned. In Kings I 15,2 we are told that the mother of King Aviyam of Yehudah was Maachah daughter of Avishalom. The reason the prophet Jeremiah saw fit to include this information was to give us a little more psychological insight into any character weakness displayed by the sons of such women. (Or, vice versa, if the mothers were outstandingly good women). If a person is an outstandingly righteous individual this reflects credit on his mother who transmitted to him so many of her positive genetic qualities.
A good branch is always testimony that the root is healthy. This is reflected in the Torah writing in Exodus 6,29: "Amram took Yocheved his aunt as a wife.⁠" The Torah mentions that a righteous person married a righteous woman and that the children were two outstandingly righteous sons, Aaron and Moses, and one outstandingly righteous woman, Miriam. The Torah reports something similar when reporting the marriage of Eleazar, son of Aaron to one of the daughters of Putiel, i.e. a descendant of the righteous Joseph (Exodus 6,25), and the son born to this union was Pinchas. We are told in Psalms that David described himself as: "I am Your servant, son of your servant maid" (Psalms 116,16). According to Kimchi, what David meant was that he had the good fortune of having been born to a father and a mother both of whom excelled in virtues.
Seeing that the Torah chose to reveal the name of the blasphemer's mother we may deduce that this was a unique occurrence during the whole forty years the Israelites wandered in the desert and that amongst the other six hundred thousand families no genealogical flaw of this kind could be found. Moreover, you must not wonder how it could be that the blasphemer's mother was an adulterous woman. She had been quite inactive in the matter. When the Egyptian climbed into her bed at night she had presumed that it was her husband joining her. The Torah applies the term זונה, (whore), to any woman who has had sexual relations with a man forbidden to her under Biblical law, regardless of whether such a union occurred voluntarily or not (Compare our comments on Leviticus 21,6).

שלומית, she would inquire after everybody's well being, prattling and saying: "hello to you (female), hello to you (male)!⁠"
בת דברי למטה דן, "daughter of Divri of the tribe of Dan.⁠" Mention of the name of the tribe shows that the deeds of a wicked person reflect discredit not only on his father and mother but also on the tribe he or she belongs to. The reverse is true of the righteous. When Oholiov was appointed as Betzalel's assistant (Exodus 38,23) the Torah does not only tell us the name of his father Achisamach, but also the name of his tribe, i.e. the tribe of Dan.