One's Jewish name consists of a number of letters of the Hebrew Alphabet. According to the holy Kabbalistic teachings of the Arizal, each Hebrew letter is a "pipeline" to bring spiritual energy from the upper worlds to our physical.
This is the reason we find original references (in the Talmud, and especially in the Kabbalah), to the theory of names, because the person's Jewish name is the channel of energy that he receives from the upper spiritual worlds, and it affects his whole human essence.
The Holy Ari teaches us that the name the parents choose for their baby is actually a 'small prophecy'. This prophetic inspiration is directed to the parents from above and enables them to give the child the exact name that is destined for him/her.
A person's birth date has a very important impact on his/her life. In the original Jewish texts it is stated that the twelve astrological signs are each related to one month of the Hebrew calendar. Each sign has its own potential energy, and this sign influences the soul that was born on that particular month.
In addition to a person's monthly astrological sign, each soul is also influenced according to which day of the week he/she was born on. Each day corresponds to one of the seven character traits taken from the ten 'sefirot'. In addition to this, each hour has its own influence on a person's soul, as we learn from G-d's Holy Name which changes every hour.
According to the Kabbalistic book "Sefer HaYitzera" each holy letter of the Hebrew alphabet corresponds to a different part of the human physical makeup.
These three concepts together (Month, Day and Time) constitute a person's luck and life opportunities.
Having said this, it is worthy to note that our Holy Sages said: "There is no luck to Israel" - Meaning that although these concepts apply to each Jew, they do not control him, and every Jew has the soul power to control and rise above their luck. In other words, although this luck does exist, the person can work to change it.
Birth Date Weekly Portion:
Each week we read on Shabbat one (or occasionally two) of the 53 weekly Torah portions. This portion influences the spiritual light and abundance which comes down to the world in this given week, as each Torah portion has its own special light and abundance which belongs specifically to it.
All the events which a person experiences during the days of his life are hinted at in his weekly Torah portion of the week in which he was born.
Your own Personal Kabbalistic Torah Code can be found using a unique blend of computer programs, which finds your name inside the weekly portion you were born in, by skipping an equal interval of letters between each letter of your name.
This method is based on the teachings of the Holy Ba'al Shem Tov, who teaches us that everything that happens in the world happens under Divine Providence and therefore there is great significance in the words and verses where we find the name of the person in the weekly portion of their birth date.