Monþs of þe Yier:

Jañuairy
Feb̃uairy
Marȶ
Âpril
May
June
Julî
August
Septembre
Octôbre
Novembre
Decembre




Citations:

Ianuarius [L]
Janvier [OF]
January [ME]
Jañuairy
https://www.etymonline.com/word/January#etymonline_v_1662
https://www.merriam-webster.com/dictionary/January
https://anglo-norman.net/entry/janvier
https://latin-dictionary.net/definition/24879/Januarius-Januaria-Januarium

februa, februare, Februarius [L]
February [ME]
Feb̃uairy
https://www.etymonline.com/word/February#etymonline_v_1185
https://www.merriam-webster.com/dictionary/February
https://latin-dictionary.net/definition/20393/Februarius-Februaria-Februarium
https://latin-dictionary.net/definition/20394/februum-februi

Martius [L]
marz, marche [OF]
March [ME]
Marȶ
https://www.etymonline.com/word/march#etymonline_v_9595
https://www.merriam-webster.com/dictionary/march#dictionary-entry-5
https://anglo-norman.net/entry/march_1
https://latin-dictionary.net/definition/26477/Martius-Martia-Martium

Aprilis [L]
avril [OF]
April [ME]
Âpril
https://www.etymonline.com/word/April#etymonline_v_15525
https://www.merriam-webster.com/dictionary/April
https://anglo-norman.net/entry/avril
https://latin-dictionary.net/definition/4203/Aprilis-Aprilis

Maia, Majus, Maius [L]
mai [OF]
May [ME]
https://www.etymonline.com/word/may#etymonline_v_12464
https://www.merriam-webster.com/dictionary/may#dictionary-entry-3
https://anglo-norman.net/entry/mai_1
https://latin-dictionary.net/definition/26213/Maius-Maia-Maium

Iunius [L]
June [ME]
https://www.etymonline.com/word/June#etymonline_v_6555
https://www.merriam-webster.com/dictionary/June
https://latin-dictionary.net/definition/24988/Junius-Junia-Junium

Iulius [L]
Juil, Jule [OF]
July [ME]
Julî
https://www.etymonline.com/word/July#etymonline_v_6547
https://www.merriam-webster.com/dictionary/July
https://anglo-norman.net/entry/juil
https://latin-dictionary.net/definition/24975/Julius-Julia-Julium

Augustus [L]
August [ME]
https://www.etymonline.com/word/august#etymonline_v_18943
https://www.merriam-webster.com/dictionary/august#dictionary-entry-2
https://latin-dictionary.net/definition/5587/Augustus-Augusta-Augustum

septem, September [L]
Septembre
https://www.etymonline.com/word/September#etymonline_v_23237
https://www.merriam-webster.com/dictionary/September
https://latin-dictionary.net/definition/34725/September-Septembris
https://latin-dictionary.net/definition/34724/septem-septimus

octo, October [L]
Octôbre
https://www.etymonline.com/word/October#etymonline_v_2485
https://www.merriam-webster.com/dictionary/October
https://latin-dictionary.net/definition/28515/October-Octobris
https://latin-dictionary.net/definition/28514/octo-octavus

novem, November [L]
Novembre
https://www.etymonline.com/word/November#etymonline_v_9841
https://www.merriam-webster.com/dictionary/November#dictionary-entry-1
https://latin-dictionary.net/definition/28019/November-Novembris-Novembre
https://latin-dictionary.net/definition/28017/novem-nonus

decem, December [L]
Decembre
https://www.etymonline.com/word/December#etymonline_v_848
https://www.merriam-webster.com/dictionary/December
https://latin-dictionary.net/definition/15761/December-Decembris-Decembre
https://latin-dictionary.net/definition/15759/decem-decimus