I know there’s a myriad of good reasons why L chose the name ‘Asahi’ for Soichiro and Light’s aliases, most of them having something to do with Light:
1, ‘Asahi’ (朝日), meaning ‘morning sun’, stood as an antonym to ‘Yagami’, meaning ‘Night god’
2, ‘Asahi Light’ is a brand of beer commonly sold in Japan and other select countries, making Light’s alias difficult for search engines while also taking the everloving piss. Clever, considering his unique original name was easy enough for Misa to search up.
3, ‘Asahi-Lite’ is a company that sells lenses, which covers bases for anyone who spells it differently (see also 2).
4, ‘Asahi Light Metal’ is another company, dealing mostly in metal stamping (see also 2).
5, ‘Asahi Light’ can be loosely translated to ‘Light Morningstar’ - reminiscent of Lucifer (the Devil), called the Morning Star. L’s enough of a shit that I wouldn’t put it past him to have this in mind.
But here’s a sixth:
A Japanese neologism is the verb ‘Asahiru’ - 朝日る - spelt the same way as above and derived from the ‘Asahi Shimbun’ (朝日新聞) newspaper, which means ‘to fabricate stories’, as in, to bullshit to fit your own narrative.
L is straight-up calling Light a liar.
