Dywedodd y Ditectif Arolygydd Rob Mahoney fod eu meddyliau gyda ffrindiau a theulu’r ddynes a fu farw.
Apeliodd y llu ar unrhyw un oedd yn yr ardal rhwng 19:00 a 20:30 i gysylltu â nhw, neu unrhyw un oedd allan gyda phlant yn dathlu Calan Gaeaf yn yr ardal.
“O bosib eich bod wedi gweld neu glywed rhywbeth, neu fod gennych ddeunydd o gamera car neu ffôn symudol a allai gynorthwyo ein hymchwiliadau.”
Mae Mr Ellis wedi cael ei gadw’n y ddalfa ac mae disgwyl iddo ymddangos yn Llys y Goron Caernarfon ddydd Mercher.
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Lawrlwythwch yr ap am y diweddaraf o Gymru ar eich dyfais symudol.
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