The name Sagi in Hebrew letters is שגיא. 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.
שגיא
In short
Your name in Hebrew letters is שגיא. A Tanakh word: “large, great” (first in Daniel 2:6). Adding up the numbers of its letters gives 314 — the same as the Torah word שטה, “acacia”. That number points to Torah page 314 of 354 — in the portion Eikev. What that portion is about: “Because you will heed”: the land of seven fruits; the blessing after meals; manna as a test; the second paragraph of the Shema. The verse that begins with the first letter of your name and ends with the last is Genesis 41:26. Each of these steps is laid out below with its sources. Every figure can be checked by hand.
You wrote “Sagi” — this exact spelling is what was calculated: שגיא. 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 שגיא gives 314.
314
The number 314 is the Torah word שטה — «acacia» (Exodus 25:5).
and the anger of HaShem be kindled against you, and He shut up the heaven, so that there shall be no rain, and the ground shall not yield her fruit; and ye perish quickly from off the good land which HaShem giveth you.
This is from the portion Eikev. What it is about: “Because you will heed”: the land of seven fruits; the blessing after meals; manna as a test; the second paragraph of the Shema.
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) — 314. A Torah word with the same number is שטה — “acacia” (Exodus 25:5).
Reduced, each letter to one digit (mispar katan) — 8. A Torah word with the same number is אהב — “to love” (Genesis 22:2).
Ordinal: alef 1, bet 2 … tav 22 (mispar siduri) — 35. A Torah word with the same number is גבל — “to set bounds” (Exodus 19:12).
Cumulative: a letter plus all letters before it (mispar kidmi) — 1157.
Squares of the letter values (mispar perati) — 90110.
Building: the sum grows with each letter (mispar bone’eh) — 1230.
The letters that come out are ברמת — not a word that stands in the Pentateuch. Atbash: letters mirrored, alef for tav, bet for shin, and the number of the resulting word — 642. A Torah word with the same number is ברכתך — “your blessing” (Genesis 27:35).
Filling: the names of the letters are counted — alef, bet, gimel… (milui) — 574. A Torah word with the same number is ולקחתיך — “and I will fetch you” (Genesis 27:45).
The number 314 appears in the classical books 45 times across 23 works. The earliest mention is ספר קרניים (~1400).
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 — 314. 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. שגיא has 4 letters: ש Shin, ג Gimel, י Yod, א Alef. The first letter is Shin, the last is Alef.
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 שגיא 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 שגיא these are ש and א. The Pentateuch has 2 such verses. The first of them is Genesis 41:26:
שבע פרת הטבת שבע שנים הנה ושבע השבלים הטבת שבע שנים הנה חלום אחד הוא
This is from the portion Miketz. What it is about: Pharaoh's dreams of seven cows and seven ears; Joseph rules Egypt; the brothers come for grain; the cup in Benjamin's sack.
«and the anger of HaShem be kindled against you, and He shut up the heaven, so that there shall be no rain, and the ground shall not yield her fruit; and ye perish quickly from off the good land which HaShem giveth you.»
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.