þayres

pron. (3rd pl. poss. (predicative))

'theirs, their affairs'

(Modern English theirs)

Etymology

Formed on þayr.

PGmc Ancestor

*þaizō-

Proposed ON Etymon (OIcel representative)

þeira 'their'
(ONP þeir (CV))

Other Scandinavian Reflexes

early runic þaiʀa, þeʀa, Far teirra, Norw deira, OSw þer(r)a, þaira

OE Cognate

þāra ‘of those’

Phonological and morphological markers

ON /ei/ < PGmc */ai/

Summary category

A1*

Attestation

Attested early in the N/EM (from Orrm) and a variety of dial by late ME. On the medieval distribution of the Norse-derived third person pronouns (and their variant spellings), see esp. Samuels 1972: 70–2, Ritt and Morse-Gagne. On the use of þayr and þayres in Gaw see also Dance 2013: 55–6.  

Occurrences in the Gersum Corpus

Gaw 1019; Cl 1527

Bibliography

MED theires (pron.) , OED their (adj. and pron.) , Dance þayres, Bj. 50