The name Geshem in Hebrew letters is גשם. 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.
גשם
In short
Your name in Hebrew letters is גשם. A Tanakh name: an Arabian (first in Nehemiah 2:19; 4 mentions in the Tanakh). Adding up the numbers of its letters gives 343 — the same as the Torah word גשם, “rain”. That number points to Torah page 343 of 354 — in the portion Ki Tavo. What that portion is about: “When you enter”: the first fruits and the declaration; the stones on Mount Ebal; blessings and admonitions. The verse that begins with the first letter of your name and ends with the last is Deuteronomy 1:37. Each of these steps is laid out below with its sources. Every figure can be checked by hand.
You wrote “Geshem” — this exact spelling is what was calculated: גשם. 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 גשם gives 343.
343
The number 343 is the Torah word גשם — «rain» (Genesis 7:12).
and against her afterbirth that cometh out from between her feet, and against her children whom she shall bear; for she shall eat them for want of all things secretly; in the siege and in the straitness, wherewith thine enemy shall straiten thee in thy gates.
This is from the portion Ki Tavo. What it is about: “When you enter”: the first fruits and the declaration; the stones on Mount Ebal; blessings and admonitions.
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) — 903.
Reduced, each letter to one digit (mispar katan) — 10. A Torah word with the same number is בדד — “alone” (Numbers 23:9).
Ordinal: alef 1, bet 2 … tav 22 (mispar siduri) — 37. A Torah word with the same number is גדל — “to grow, be great” (Genesis 12:2).
Cumulative: a letter plus all letters before it (mispar kidmi) — 1246.
Squares of the letter values (mispar perati) — 91609.
Building: the sum grows with each letter (mispar bone’eh) — 649. A Torah word with the same number is תרדמה — “deep sleep” (Genesis 2:21).
The letters that come out are רבי — not a word that stands in the Pentateuch. Atbash: letters mirrored, alef for tav, bet for shin, and the number of the resulting word — 212. A Torah word with the same number is ריב — “quarrel, dispute” (Genesis 26:20).
Filling: the names of the letters are counted — alef, bet, gimel… (milui) — 523. A Torah word with the same number is נתחכמה — “let us deal shrewdly” (Exodus 1:10).
The number 343 appears in the classical books 2 times across 2 works. The earliest mention is יהל אור (~1800).
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 — 343. 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. גשם has 3 letters: ג Gimel, ש Shin, ם final Mem. The first letter is Gimel, the last is final Mem.
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 גשם does not stand as a separate word in the Torah, but appears 2 times with prefixes — first in Γένεση 7:12.
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 גשם these are ג and מ. The Pentateuch has exactly one such verse — Deuteronomy 1:37:
גם בי התאנף ה׳ בגללכם לאמר גם אתה לא תבא שם
This is from the portion Devarim. What it is about: Moses begins his address in the plains of Moab: judges, spies, forty years of wandering, the victories over Sihon and Og.
The name גשם has no such day. The numbers of the dates in a year cover 326 values out of 940, and 343 is not among them. Half of all names are like this — neither good nor bad, just a fact of counting.
Add a date of birth and the verse of meeting from that week's portion is added to the reading.
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.