Did Johan Jacob Blåfield change his last name to Brus

Question

My reasoning is explained in the research notes with sources.

Answer 1

Yes he did.
I read the research notes and I looked at all the sources.
There is no doubt your conclusion is correct.

Also, adding one more piece of evidence:
In Soldatregistret he has the patronym "Gustafsson" which is correct, since his father's name is Gustaf Henrik Blåfield.
https://www.soldatreg.se/sok-soldat/
Search: Soldatens namn: "BRUS Johan Jakob"

Centrala Soldatregistret

BRUS Johan Jakob

Släktnamn: Gustafsson

Född: 1772

Död: -

Antagen: 1793

Avsked: 1806

Aktnummer: VR-06-0105-1793

Regemente: Västmanlands regemente

Rote: Lilla Rocklunda

Kompani: STRÖMSHOLMS KOMPANI

Socken: ODENSVI

Torpnummer: VR-06-0105

Comments

Also, searching for his soldier farm, (soldattorp):
https://www.soldatreg.se/sok-soldat
Search: Rote: "Lilla Rocklunda"

That gives a long list of soldiers, all named Brus, from 1687 to 1810. This proves this was a long tradition, if you took over the soldier farm Lilla Rocklunda, you took over the name Brus.

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Birth place.
Rytterne parish is right next to Munktorp parish.

He was born in 1772 at Ekeby (Stora Ekeby, Herrgård/Säteri) in Rytterne parish.
https://www.svenskaherrgardar.se/herrgardsdatabasen/gard/12006
Ekeby is very close to  Munktorp parish.
https://www.hembygd.se/shf/plats/2811

Then they lived in Munktorp parish from at least 1773, when he was 1 year old.
https://www.hembygd.se/shf/plats/2602

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Odensvi kyrkoarkiv
https://sok.riksarkivet.se/?postid=Arkis+{9446bffc-49d8-11d5-a6ed-0002440207bb}&s=Balder

HHE:
Odensvi (U) AI:9 (1800-1810) Bild: 168 Sida: 328
https://app.arkivdigital.se/volume/v73650?image=168&page=328

HHE:
Odensvi AI:10 (1811-1818) Bild 14 / Sida 20
https://app.arkivdigital.se/volume/v73651?image=14&page=20

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Heds kyrkoarkiv
https://sok.riksarkivet.se/?postid=Arkis+{9446bc87-49d8-11d5-a6ed-0002440207bb}&s=Balder

HHE:
Hed AI:7 (1806-1815) Bild 155 / Sida 148
https://app.arkivdigital.se/volume/v72401?image=155&page=148

HHE:
Hed AI:8 (1816-1825) Bild 124 / Sida 120
https://app.arkivdigital.se/volume/v72402?image=124&page=120
-He lives with his son Anders (b. 8 Aug 1812)
-His wife dies 1823: Stina Andersdotter (b.1766 m.1794 d. 4 Mar 1823)

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HHE:
Hed (U) AI:9 (1825-1831) Bild: 194 Sida: 189
https://app.arkivdigital.se/volume/v72403?image=194&page=189
-Johan Jacob has remarried and then died.
-Johan Jacob's son Anders Bruse (b. 8 Aug 1812) is living with Johan Jacob's second wife, the widow Anna Riddarström (b. 12 Nov 1774) "Bruses Enka"
-Conclusion: Johan Jacob died sometime between 1823-1826, probably in Hed parish.

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Death record 11 Apr 1826:
Hed (U) F:4 (1776-1830) Bild: 180 Nr: 10
https://app.arkivdigital.se/volume/v72437?image=180

"Dagkarlen Johan Jacob Bruse vid Malmen"
"4 barn, 2 söner, 2 döttrar i första giftet lefva. I senare giftet inga barn."
"Olyckshändelse Drunknad"
"Dödsdag 11 Apr i Hedströmmen vid Norrhammar"
"54 år 1 månad 16 dagar"
"Begravd 16 april"

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Marriage 26 Sep 1823:
Hed (U) EI:2 (1776-1850) Bild: 49 Nr: 3
https://app.arkivdigital.se/volume/v72430?image=49

Brudgum
Förnamn: Jakob
Efternamn: Bruse
Titel/Yrke: Dagkarlen
Hemort: Malmen
Brud
Förnamn: Anna
Efternamn: Riddarström
Titel/Yrke: Änkan
Hemort: Malmen