The name Belshazzar in Hebrew letters is בלאשצר. 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.
בלאשצר
In short
Your name in Hebrew letters is בלאשצר. A Tanakh name: a Babylonian king (first in Daniel 8:1; 1 mention in the Tanakh). Adding up the numbers of its letters gives 623 — the same as the Torah word יגרתי, “I dreaded”. That number points to Torah page 269 of 354 — in the portion Pinchas. What that portion is about: The covenant of peace with Phinehas; the second census; the daughters of Zelophehad and inheritance; Joshua the successor; the festival offerings. The verse that begins with the first letter of your name and ends with the last is Genesis 49:6. Each of these steps is laid out below with its sources. Every figure can be checked by hand.
You wrote “Belshazzar” — this exact spelling is what was calculated: בלאשצר. 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 בלאשצר gives 623.
623
The number 623 is the Torah word יגרתי — «I dreaded» (Deuteronomy 9:19).
Wherefore say: Behold, I give unto him My covenant of peace;
This is from the portion Pinchas. What it is about: The covenant of peace with Phinehas; the second census; the daughters of Zelophehad and inheritance; Joshua the successor; the festival offerings.
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) — 623. A Torah word with the same number is יגרתי — “I dreaded” (Deuteronomy 9:19).
Reduced, each letter to one digit (mispar katan) — 20. A Torah word with the same number is היה — “to be, become” (Genesis 1:2).
Ordinal: alef 1, bet 2 … tav 22 (mispar siduri) — 74. A Torah word with the same number is עד — “until, as far as” (Genesis 3:19).
Cumulative: a letter plus all letters before it (mispar kidmi) — 2494.
Squares of the letter values (mispar perati) — 139005.
Building: the sum grows with each letter (mispar bone’eh) — 1446.
The letters that come out are שכתבהג — not a word that stands in the Pentateuch. Atbash: letters mirrored, alef for tav, bet for shin, and the number of the resulting word — 730.
Filling: the names of the letters are counted — alef, bet, gimel… (milui) — 1571.
The number 623 appears in the classical books 4 times across 4 works. The earliest mention is שער הפסוקים (~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 — 623. 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. בלאשצר has 6 letters: ב Bet, ל Lamed, א Alef, ש Shin, צ Tsadi, ר Resh. The first letter is Bet, the last is Resh.
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 בלאשצר 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 בלאשצר these are ב and ר. The Pentateuch has 7 such verses. The first of them is Genesis 49:6:
בסדם אל תבא נפשי בקהלם אל תחד כבדי כי באפם הרגו איש וברצנם עקרו שור
This is from the portion Vayechi. What it is about: Jacob blesses Ephraim and Manasseh and all his sons; Jacob's death and burial in Hebron; Joseph's death.
The name בלאשצר has no such day. The numbers of the dates in a year cover 326 values out of 940, and 623 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.