The name Sebastiana in Hebrew letters is סבסטיאנה. Below: how its number adds up, which page of the Torah it falls on and what verse stands there. Everything is computed, nothing is guessed.
סבסטיאנה
In short
Your name in Hebrew letters is סבסטיאנה. Adding up the numbers of its letters gives 197 — the same as the Torah word בקצה, “at the edge”. That number points to Torah page 197 of 354 — in the portion Achrei Mot. What that portion is about: The service of Yom Kippur: two goats, the lot, the Holy of Holies; the prohibition of blood; the laws of forbidden unions. The verse that begins with the first letter of your name and ends with the last is Numbers 14:19. Each of these steps is laid out below with its sources. Every figure can be checked by hand.
You wrote “Sebastiana” — this exact spelling is what was calculated: סבסטיאנה. A name from the Tanakh — its Tanakh spelling is used. If your name is spelled differently, correct the Hebrew spelling and the report is recomputed.
Adding up the letters of the name סבסטיאנה gives 197.
197
The number 197 is the Torah word בקצה — «at the edge» (Genesis 23:9).
And whatsoever man there be of the children of Israel, or of the strangers that sojourn among them, that taketh in hunting any beast or fowl that may be eaten, he shall pour out the blood thereof, and cover it with dust.
This is from the portion Achrei Mot. What it is about: The service of Yom Kippur: two goats, the lot, the Holy of Holies; the prohibition of blood; the laws of forbidden unions.
Other ways of counting
The tradition counts the same name in several ways. The main one is above: each letter is its number. The other eight are old and checkable too; each gives its own number, and many of them have a Torah word with the same number.
Final letters as 500–900 (mispar gadol) — 197. A Torah word with the same number is בקצה — “at the edge” (Genesis 23:9).
Reduced, each letter to one digit (mispar katan) — 35. A Torah word with the same number is גבל — “to set bounds” (Exodus 19:12).
Ordinal: alef 1, bet 2 … tav 22 (mispar siduri) — 71. A Torah word with the same number is מלא — “to fill” (Genesis 1:22).
Cumulative: a letter plus all letters before it (mispar kidmi) — 824. A Torah word with the same number is תחתיו — “in his place” (Genesis 36:33).
Squares of the letter values (mispar perati) — 9911.
Building: the sum grows with each letter (mispar bone’eh) — 1047.
The letters that come out are חשחנמתטצ — not a word that stands in the Pentateuch. Atbash: letters mirrored, alef for tav, bet for shin, and the number of the resulting word — 905.
Filling: the names of the letters are counted — alef, bet, gimel… (milui) — 1314.
The number 197 appears in the classical books 1 time across 1 work. The earliest mention is פרי עץ חיים שער העמידה (~1573).
Every letter of the name explained, the words and namesakes with references, the Hebrew date, the letter and tribe of the month, day 861 of your life (±1), the psalm by age, the attestations from the classical books — a PDF sent to your email.
The number of the day, every morning
Every date has a number too. Once a year it will match the number of your name — 197. The channel posts one number a day, one verse and the Torah page it lands on. Nothing after it, no mailing list.
Hebrew is written from right to left. סבסטיאנה has 8 letters: ס Samekh, ב Bet, ס Samekh, ט Tet, י Yod, א Alef, נ Nun, ה He. The first letter is Samekh, the last is He.
For an engraving, a sign or a tattoo, show the spelling to someone who reads Hebrew: transliterating a name is a choice, not the only option.
The name סבסטיאנה does not stand as a word in the Pentateuch — as with most names, including many Tanakh names from the later books.
The verse of your name
There is a custom: at the end of the prayer one says a Torah verse that begins with the first letter of one's name and ends with its last. For סבסטיאנה these are ס and ה. The Pentateuch has exactly one such verse — Numbers 14:19:
סלח נא לעון העם הזה כגדל חסדך וכאשר נשאתה לעם הזה ממצרים ועד הנה
This is from the portion Shlach. What it is about: The twelve spies; forty years for forty days; challah and tzitzit.
Any name written in Hebrew letters is a number: סבסטיאנה = 197. And every date has a number of its own. There is a day in the year when the two coincide.
«And whatsoever man there be of the children of Israel, or of the strangers that sojourn among them, that taketh in hunting any beast or fowl that may be eaten, he shall pour out the blood thereof, and cover it with dust.»
Each Hebrew letter has a number; a word's number is their sum (alef 1 … tav 400). The page is the remainder modulo 354: the Torah divided into 354 pages of 861 letters, as the lunar year has 354 days. Everything can be checked by hand.