Hittar inte mycket litteratur. Borrköl och Borrekölspira innehåller "köl", som möjligen anspelar på kölen som gräns mellan Sverige och Norge:
https://sv.wikipedia.org/wiki/K%C3%B6len
"Kölen – den långa fjällrygg som på vissa breddgrader utgör gräns mellan Sverige och Norge"
Borrekölspira innehåller dessutom "spira". Vad kan det anspela på?
https://digitaltmuseum.se/021028440769/spira
"Spira En spira kan vara: Spira (stav) – en kort stav som utmärker befälsrätt eller makt Spira (rigg) – en trästång i segelfartygs rigg Spira – medeltida namnet på den tyska staden Speyer Spira"
Kan man lära sig något genom att studera "den tyska staden Speyer Spira"? Jag har markerat med fet stil de mer intressata delarna av texten:
https://de.wikipedia.org/wiki/Speyer
"This Roman military post became the impetus for the formation of the city. Around 150, the city appeared under the Celtic name Noviomagus (Neufeld or Neumarkt, see all Noviomagus) in the world map of the Greek Ptolemy; the same name can be found in the Itinerarium Antonini, a travel manual of Antony from the time of Caracalla (211–217) and on the Tabula Peutingeriana, a road map from the 3rd century. From 260 onwards, the constant attacks of the Alemanni on the Limes as part of the migration of peoples could no longer be repelled, the
Roman imperial border had to be taken back to the Rhine, and Speyer became a border town again. For the 4th century, Jesse is documented as the first bishop of Speyer; the diocese probably perished during the Migration Period.
In 406, Suebi, Vandals and Sarmatian Alans crossed the Rhine under pressure from advancing Huns and overran Speyer on their way to inner Gaul. A richly furnished "princely grave" in Altlußheim on the right bank of the Rhine, about four kilometres from Speyer, testifies to the presence of Alano-Sarmatians, Huns or East Germans. [5]"
"
The name Spira, introduced by the Alemanni, was first mentioned in the 6th century in the Notitia Galliarum, although it was already used in 496/509."
