Hungarian Historical Phonology merül
mer 'schöpfen'
merít 'schöpfen, tauchen'
merül 'sinken, versinken, tauchen'
First attestation/Old Hungarian data
[coming]
Important dialectal forms
[coming]
Uralic/Ugric/Pre-Hungarian reconstruction
? *märV-
(Disputed:)
UEW: PUg *märɜ- 'dive, plunge; untertauchen'
Status of the Ugric etymology
Unclear
Loan etymology
None suggested
Cognates suggested in earlier research
UEW:
Khanty: East (J) mȧ̆rət- 'untertauchen', South (DN) mĕrət- 'tauchen', North (O) mȧ̆rət- 'tauchen'
Mansi: East (KM) mɔ̈̄rəŋ pat 'далеко ныряет эта утка', West (LM) marėχt- 'öfters tauchen', North (LO) wās jol-māraχtės 'утка нырнула', (N) jol-mārėχt- 'öfters untertauchen' < PMs *mǟr-
Commentary
Hungarian mer- and Mansi *mǟr- could be derived from Proto-Ugric *märV-; however, the Khanty vocalism is problematic, and it cannot be derived from Proto-Ugric *ä regularly.
Semantically the etymology is plausible. Because of the problems with the Khanty word, the Ugric etymology is not correct as such, but for the Hungarian and Mansi cognates a common proto-form could be reconstructed.
Conclusion
The Khanty word cannot be derived from PUg *märV-, but the relationship of Hu mer- and Mansi *mǟr- is possible.
References
UEW s.v. märɜ-: Proto-Ugric Uralonet