Does the particle や come after particles like に or で (as does も in「にも」or「でも」),
or does it come before them? I can't find any examples of either, be it
through Google; in the Tatoeba database; or otherwise.
CC BY-SA 4.0
2018-06-30T21:42:33.897
59815
2018-07-02T00:36:40.650
30460
question
particle-に particle-で particle-や
Ordering of Particles:「にや」OR「やに」?
や in the sense that you are using it, is a linking particle between 2 or more
nouns, and cannot be left "hanging" after a noun or noun phrase, so you would
not have to worry about how to connect it to other particles.

If you want to imply "etc." or "and others", "and so on" after a single noun
or noun phrase, then **など** (or などなど) would be more grammatical. Depending on
the circumstances, とか might also be acceptable.

YES: 一等親 **や** 友達には  
YES: 一等親 **や** 友達 **など** には  
YES: 一等親 **などなど** (の関係人)には  
NO: 一等親 **や** には
CC BY-SA 4.0
2018-07-01T01:21:30.100
59817
2018-07-01T01:21:30.100
29347
59815
answer
You would expect very little possibility to see the coordinative や and the
case particle に next to each other.

や factors out the shortest different sections, so you will find [particle]+や
in a `XやY` composition that _X_ and _Y_ ends in different particles.

> {東京 **や** 仙台] _から_ 来た人 (diff. nouns w/ same particle)
>
> 在籍期間が[2012年 _まで_ ‌ **や** 2018年 _から_ ]の人 (diff. nouns w/ diff. particles)

That means the theoretical order would be にや, but in reality, you will be not
likely to encounter such a situation, because に is one of central case marker
in Japanese, and や stricter about syntactic leanness than its kinds* (such as
か, とか and やら), which means, you need another particle, that is different than
に but compared to に, to make something like にや appear. That would result in a
very terrible type of
[zeugma](https://en.wikipedia.org/wiki/Zeugma_and_syllepsis), like conjoining
subject and object together.

* * *

* cf.

> [じぶんがいじめられたら先生 _に_ ‌ **とか** ともだち _に_
> そうだんする。](http://www.nhk.or.jp/ijimezero/sengen_school/kantou/11_91.html)  
>  × 先生 _に_ ‌ **や** ともだち _に_ そうだんする。
CC BY-SA 4.0
2018-07-02T00:36:40.650
59832
2018-07-02T00:36:40.650
2020-06-17T08:18:27.500
-1
7810
59815
answer