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Name Inspiration

Per Viking Answer Lady:

Bróðir - Found in Old Danish as Brothir and in Old Swedish Brodhir, in both locations the name occurs as both a personal name and a by-name. Found in OW.Norse as Bróðir. From OW.Norse bróðir "brother". A few late instances are found in West Scandinavia. The name is common in Sweden and Denmark. Runic examples include the nominative forms broþir, bruþ(in)m, bruþiR, burþiR, the accusative forms [br](þ)(u)r, [bruþur], and in one form in which the case is uncertain as buruþR. Sources: FJ p. 65 s.n. Bróðir; NR s.n. BróðiR
http://www.vikinganswerlady.com/ONMensNames.shtml

Scandinavian patronymic of Hartvig per SENA Appendix A (later period alt with -son)

Hartvig, male christened 1635, Copenhagen, Denmark, his father is "Hans Hartvigssen" - Batch C21849-1, https://www.familysearch.org/ark:/61903/1:1:XYN4-C21
also found undated at https://www.nordicnames.de/wiki/Hartvig

Diplomatarium Danikum

1353. 4. december - Danish: "Jeg Ivan von Reventlow, hr. Hartvig von Reventlows søn..."; original Middle Low German "Ich Ywan van Reventlo, heren Hartwiges sone van Reventlo..." https://diplomatarium.dk/dokument/13531204001
1366. 24. februar. - Danish: "...Johan Hummersbüttel, ridder, og min broder Hartvig Hummersbüttel..."; Original Latin: "...Iohannes Huͤmmersbutle miles et Hartwicus Huͤmmersbuͤtle frater..."
https://diplomatarium.dk/

Norwegian Farm Names -

Farm no. 12 Farm: Hartvigvandet nedre Parish: Ankenes Muncipality: Ankenes County: Nordlands amt
Listen over gårder er hentet fra "Norske Gaardnavne". v.16, p.283 12. Hartvigvandet nedre. Udt. h?´rtvigvattne. Ligger tilligemed GN. 13-18 i en s?rskilt Gr?nd ved et Vand af samme Navn, som maa v?re dannet af Mandsnavnet Hartvig.
Translation: "The list of farms is taken from "Norske Gaardnavne". v.16, p.283 12. Hartvigvandet lower. Udt. h? ´rtvigvattne . Also located at GN. 13-18 in a separate plot by a water of the same name, which must have been formed by the male name Hartvig."
Date?
https://www.dokpro.uio.no/perl/navnegransking/rygh_ng/rygh_soek.prl?s=e&AMT=&start=Search&HERRED=&SOGN=&GNAVN=&GNR=&LITTREF=&REFORDF=&BIND=&SIDE=&SOEKESTRENG=hartvig&med_amt=on&med_herred=on&med_sogn=on&konkordanse_streng=hurtigliste&sort_tfunn=-&sort_amt=1&sort_herred=2&sort_sogn=3&sort_gard=4

Finnish Names Article

Broðir c. 1100 plus Hartvigssen (Hartvig 1353) are less than 300 years apart, which is registerable either as 100% Scandinavian or as a Scandinavian/German name.
Scandinavian (Broðir) can be mixed with German (Hartvig from the German Hartwig) per Appendix C

No conflicts with bróðir, broðir, brodir. No conflicts with Hartvigsen, Hartvig, Hertvig, H.rt/S+ (. and /S+ are wild-cards)