おねいちゃん vs おねえちゃん


In this frame from ３月のライオン, Akari, the eldest of the Kawamoto sisters is being
referred to as おねいちゃん rather than おねえちゃん.
<https://gyazo.com/e039edc3be657a4f1082dd9d152c0ae7>

In this separate scene, it also sounds like she's being called 'おねいちゃん' than
'おねえちゃん' as well
[https://www.youtube.com/watch?v=suKLH_18tPI&t=59s](https://www.youtube.com/watch?v=suKLH_18tPI&t=59s)

Is おねいちゃん commonly used and what would be the difference from おねえちゃん?




おねいちゃん is an incorrect or variant spelling/pronunciation of おねえちゃん. There is
no semantic difference.

In my perception, the usage of おねいさん is sometimes found in manga among
children or less educated people who otherwise use standard (Kanto) accent.
The most famous user of おねいさん is [Nohara
Shinnosuke](https://en.wikipedia.org/wiki/Crayon_Shin-chan) (although he also
uses unusual words like オラ and speaks with a peculiar accent).

This type of "double vowel" confusion is characteristic of [Shitamachi
kotoba](https://en.wikipedia.org/wiki/Yamanote_and_Shitamachi#Speech) of
Tokyo. However, this spelling isn't necessarily used to strictly represent a
specific dialect. It might simply be used as an (often cute) alternative
spelling to add flavor to a character.

I found an interesting analytical article by a language enthusiast
specifically about this topic:

[「おねいちゃん」という表記は方言に拠るものか](http://wotakokko.jugem.jp/?eid=275)

But there's probably no need to analyze it so strictly for most people. It's
fine to recognize it just as an uncommon alternative of おねえさん.




おねいちゃん is an incorrect or variant spelling/pronunciation of おねえちゃん. There is
no semantic difference.

In my perception, the usage of おねいさん is sometimes found in manga among
children or less educated people who otherwise use standard (Kanto) accent.
The most famous user of おねいさん is [Nohara
Shinnosuke](https://en.wikipedia.org/wiki/Crayon_Shin-chan) (although he also
uses unusual words like オラ and speaks with a peculiar accent).

This type of "double vowel" confusion is characteristic of [Shitamachi
kotoba](https://en.wikipedia.org/wiki/Yamanote_and_Shitamachi#Speech) of
Tokyo. However, this spelling isn't necessarily used to strictly represent a
specific dialect. It might simply be used as an (often cute) alternative
spelling to add flavor to a character.

I found an interesting analytical article by a language enthusiast
specifically about this topic:

[「おねいちゃん」という表記は方言に拠るものか](http://wotakokko.jugem.jp/?eid=275)

But there's probably no need to analyze it so strictly for most people. It's
fine to recognize it just as an uncommon alternative of おねえさん.

