Dear translators of this version,
Please consider translating his name as 'Ragnar' or 'Ragnarr' instead. 'Ragna' is the female form of that name, and the MC is presented as a cis male.
'Ragnar' is modern, 'Ragnarr' more historical.
I am aware that doesn't fit 100% with the Japanese, but it is close enough and it is more important to be immersive than faithful, in my humble opinion.