Born on Monday — which letters should I keep out of my name?

The kalakini group for Monday is ะ า ิ ี ุ ู เ แ โ ใ ไ ฤ ฦ, so those are the ones to avoid under the rule set DekDuangDee uses. Every other letter is fine.

Do I use my real birth day, or the day I register the change?

Always your real day of birth. Tāksā is tied to the name-holder's birth day, never to the date the change is filed.

Will changing my name actually improve my luck?

It is a cultural belief, not something science can prove. Many people say they feel more confident holding a name that is correct by the tradition they follow. DekDuangDee helps you pick a name that is correct by Tāksā; life outcomes depend on much else.

Does my nickname have to change too?

No. Nicknames sit outside Thaksa-Pakorn entirely — keep yours. The system applies to the formal name on your documents.

Changing your name for luckMonday

Changing your name when you were born on Monday (2026): the kalakini letters to avoid, and names to consider

Changing your name as an adult is very common in Thailand — often after a rough stretch, or simply to hold a name that feels more auspicious. The system used is the same one parents use for a newborn.

Thaksa-Pakorn is computed from the name-holder's day of birth, not the day the name is picked — and your birth day never changes. So if you were born on Monday, you check both your current name and any candidate against Monday's table, at any age.

Check the letters in your current name

Read your formal name letter by letter and compare it with the list below. If even one appears, tradition reads that name as carrying a letter in Monday's kalakini house — which is the reason many people decide to change.

ะ า ิ ี ุ ู เ แ โ ใ ไ ฤ ฦ

Monday's kalakini set is a vowel group, and Wednesday splits into day and night — if you were born on a Wednesday you need your time of birth.

The houses tradition prizes for someone born on Monday

Beyond clearing the kalakini letters, people changing their name usually favour one whose letters land in Decha, Si and Montri — the three houses tradition prizes. For someone born on Monday those letter groups are:

Dechapower & honorฎ ฏ ฐ ฑ ฒ ณ
Siglory & wealthด ต ถ ท ธ น
Montrimentors & supportศ ษ ส ห ฬ ฮ

See all 8 Tāksā houses for Monday

Auspicious names for women born on Monday

Every name here is clear of Monday's kalakini letters, ranked by real-world usage. Tap a name for its pronunciation, meaning, and full Tāksā reading.

See every girls' name for Monday

Auspicious names for men born on Monday

Every name here is clear of Monday's kalakini letters, ranked by real-world usage. Tap a name for its pronunciation, meaning, and full Tāksā reading.

See every boys' name for Monday

The legal side of changing a first name

A first-name change is filed at the district registration office (or Bangkok khet office) for your house registration. In general you bring your national ID card and a copy of the house registration; once the registrar approves, you receive the official name-change certificate commonly known as form Chor 3 (ช.3).

With the certificate in hand you then update your ID card, house registration, passport, bank accounts, and anything else still under the old name. Fees, documents, and timelines vary between offices, so it is worth calling ahead.

This is a general overview for orientation, not legal advice. Follow the procedure your own registration office gives you.

Check a candidate name before you commit

The DekDuangDee app carries many more firstnames, each with its meaning, pronunciation, and a Tāksā reading for your birth day.

Download for iPhone Download for Android

Frequently asked questions

Born on Monday — which letters should I keep out of my name?: The kalakini group for Monday is ะ า ิ ี ุ ู เ แ โ ใ ไ ฤ ฦ, so those are the ones to avoid under the rule set DekDuangDee uses. Every other letter is fine.
Do I use my real birth day, or the day I register the change?: Always your real day of birth. Tāksā is tied to the name-holder's birth day, never to the date the change is filed.
Will changing my name actually improve my luck?: It is a cultural belief, not something science can prove. Many people say they feel more confident holding a name that is correct by the tradition they follow. DekDuangDee helps you pick a name that is correct by Tāksā; life outcomes depend on much else.
Does my nickname have to change too?: No. Nicknames sit outside Thaksa-Pakorn entirely — keep yours. The system applies to the formal name on your documents.

Changing your name — other birth days

Sunday Tuesday Wednesday (day)Wednesday (night)Thursday Friday Saturday

Keep reading

Thaksa-Pakorn is a cultural tradition, not a scientifically predictive system. Different schools use slightly different tables.