Kanji on a sword tang

[Jags1]

Evening,
I picked up another Katana and, while I was told it was, I'm not sure that it's of WWII vintage. Just not sure.... Would someone be so kind to translate the kanji on the tang?
Many thanks as always....
John

 

[Toritoribe]

It's a female name 小川歩子 Ogawa Ayuko (or Ayako). Hmm, I don't think it's, at least, the name of the swordsmith in WW2 era (or before).

 

[Jags1]

Thanks... It's a weird one as it's technical/mechanically correct but it has the number 50 on the edge of the tang and a serial number on the habaki.... Maybe really late war or made as a personal sword?
Again, thanks!