Hungarian Historical Phonology gyökér
gyökér 'root; Wurzel; Ursprung, Quelle'
First attestation/Old Hungarian data
[coming]
Important dialectal forms
gyüker
gyükér
(see UEW)
Uralic/Ugric/Pre-Hungarian reconstruction
(Disputed:)
UEW: PUg *jȣ̈kkɜ-rɜ 'root; Wurzel'
Status of the Ugric etymology
Improbable (phonologically irregular)
Loan etymology
None suggested
Possible substrate loans (new suggestion)
Cognates suggested in earlier research
Mansi: South (TJ) jükǟr, East (KU) jēk˳ər, West (P) jēkər, North (So) jēk˳ar 'die Wurzeln eines umgefallenen Baumes'
Commentary
WOT doubts the etymology and notes it is irregular, but the etymology is defended by Honti (2017). South Mansi vocalism is apparently irregular. The scarcity of Hu gy < *j in inherited words casts doubt. However, the Ugric words are probably somehow related, perhaps as parallel loanwords.
Conclusion
No PUg word can be reconstructed.
References
EWUng
Honti 2017: 98-99: Proto-Ugric
Róna-Tas 2017: 63: Proto-Ugric
UEW s.v. jȣ̈kkɜ-rɜ: Proto-Ugric Uralonet
WOT 1318: Proto-Ugric