What is the meaning of や?

The hiragana syllable や (ya). Its equivalent in katakana is ヤ (ya). It is the thirty-sixth syllable in the gojūon order; its position is や行あ段 (ya-gyō a-dan, “row ya, section a”).

used to express a nonexhaustive list: and, or

(immediately) upon

1. used to mark an exclamation
2. used to show indifference

   used to mark an exclamation

   used to show indifference

   1. placed after a name to call someone
   2. used to emphasise certain adverbs

      placed after a name to call someone

      used to emphasise certain adverbs

      to be

      alternative form of いや (iya)

      alternative form of は (wa, topic marker)

      topic marker

      Source: wiktionary.org