What is the meaning of -ya?

forms abstract nouns from adjectives or nouns

to be

third person singular accusative enclitic

Alternative form of -a

they

Forms reverential terms.

Forms the singular of the recent past perfective tense of the verb ei (to be).

Forms the singular of the distant past perfective tense of the verb ei (to be) when both the agent and patient (if there is one) of the verb are third-person.

Allomorph of -a (nonpast or past imperfective suffix) used for stems that end in i.

Verbal suffix

Back vowel variant of after vowels

Rōmaji transcription of

Transformative suffix: to become.

causative suffix

used after verbs stems ending -k- (but not in -ek- or -ik-) with spirantization of the -k- to -sh-

used in some verbs interchangeably with -isha/-esha

used to construct a causative verb with slightly different meaning

Source: wiktionary.org