Ionawr, Ionor - January    

Chwefror, Chwefrol -February                

Mawrth - March 

Ebrill - April 

Mai - May 

Mehefin - June 

Gorffennaf, Gorphenaf - July

Awst - August 

Medi - September 

Hydref - October 

Tachwedd - November 

Rhagfyr - December 

un - 1           dau - 2 

tri - 3            pedwar - 4 

pump - 5     chwech - 6 

saith - 7       wyth - 8 

naw - 9         deg - 10 

ugain - 20    deg ar hugain - 30 

a aned, a anwyd - who was born

a enwir/enwyd uchod - named above

a fu farw - who died 

a gafodd ei ddiwedd - met his end

a gladdwyd - who was buried

ab, ap - son (of) 

annwyl - loving 

blwyddyn - year 

blwydd, mlwydd - year (after number)

brawd, brodyr - brother 

bu farw - he (she) died 

chwaer, chwiorydd - sister 

claddwyd - was buried 

diwrnod, dydd - day 

eglwys - church 

ei annwyl wraig - his dear/beloved wife

ei fab - his son 

ei ferch - his daughter 

ei gwr - her husband 

ei mab - her son 

ei merch - her daughter 

er cof am - in memory of 
eu plentyn, plant - their child, children
coffadwriaeth - remember, remembrancee
diwrnod, dydd - day 
eglwys - church 
ei annwyl wraig - his dear/beloved wife
ei fab - his son 
ei ferch - his daughter 
ei gwr - her husband 
ei mab - her son 
ei merch - her daughter 
er cof am - in memory of 
eu plentyn, plant - their child, children
gorffwys, gorphwys - rest 
gwraig - woman, wife
gynt - formerly 
hefyd - also
hunodd - died
mam - mother mam-gu - grandmother 
mewn hiraethus gof - in grieving memory 
mis, -oedd - month(s) 
oed, oedran - age 
plant - children 
plwyf - parish 
serchus, serchog - loving, affectionate
tad - father 
tad-cu, taid - grandfather 
tyner, yn dyner - tender, tenderly 
wythnos - week 
ymadawedig - departed, deceased

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If you have some spare time on your hands there is a very long article in

Welsh, The Eighth Wonder

about the Welsh Language and its survival