The name, “Shining Wind” was taken after KH’s literal translation, “the wind shines”.
However, the words Kaze Hikaru, or 風光る, actually embed a meaning of spring. Generally, it entails a warm breeze of spring that follows after a dark cold winter, comes and breathes gently upon the skin, as if like a shining radiance.
The term “Kaze Hikaru” was often referenced to a poem by Hajikata Toshizo:
“風光る Kaze Kikaru
誠の旗に Makoto no Nata ni
花ごろも Hana goro mo“
The poem could also be translated with the meaning as:
“The wind shines upon the flag of truth*, like a symphony of flower.“
(*The signature character on the Flag of Shinsengumi was “Makoto (誠)“, entails the meaning of truth, honesty and loyalty.)
So overall, I would summarise the theme of KH as:
“A warm breeze of spring, breathing upon the flag of Makoto, like the shining wind.“
Walah! : )
For KH synopsis: click here