********************************
Polish :

Styczeń
Luty
Marzec (influenced by Latin but the original polish name has existed))
Kwiecień
Maj (definately from Latin - polish name has existed too)
Czerwiec
Lipiec
Sierpień
Wrzesień
Październik
Listopad
Grudzień

********************************
German

Hartung - January
Hornung - February
Lenzing - March
Ostermond - April
Wonnemond - May
Brachet - June
Heuert - July
Ernting- August
Scheiding - September
Gilbhart - October
Nebelung - November
Julmond - December

********************************

Spanish we always write the months in lower case:
enero
febrero
marzo
abril
mayo
junio
julio
agosto
septiembre o setiembre
octubre
noviembre
diciembre

********************************

Germanic languages had native name for the months of the year. Some of them were similar in large areas; others were not. They can be found at: http://www.geonames.de/months.html. However, this list does not include North Frisian. The mainland dialects have preserved the native names:

J: ismoune, literally ice month
F: biikenmoune, beacon month
M: uursmoune, spring month
A: gjarsmoune grass month
M: krülemoune flower month
J: samermoune summer month
J: foodermoune, fodder month
A: beeridmoune, harvest month
S: härfstmoune, autumn month
O: stormmoune, storm month
N: mistmoune, mist month
D: jülmoune, yule month

********************************

JANUARY - GERAR - (Latin “gelum - coldness”)
FEBRUARY - FAURAR - (Latin “Faber - Maker”)
MARCH - MARTISOR - (Latin “Mars”)
APRIL - PRIER - Aprilie - (Latin “April - April”)
MAY - FLORAR - (Latin “Floris - flower”)
JUNE - CIRESAR - (Latin “Ceresia - cherry”)
JULY - CUPTOR - (Latin “coctorium - owen”)
AUGUST - GUSTAR (Latin “gustare - to taste”)
SEPTEMBER - RAPCIUNE - Unknown
OCTOBER - BRUMAREL (Latin “bruma - little white frost”)
NOVEMBER - BRUMAR - (Latin “bruma - white frost”)
DECEMBER - UNDREA - Unknown

********************************

Welsh
January - Ionawr
February - Chwefror
March - Mawrth
April - Ebrill
May - Mai
June - Mehefin
July - Gorffenaff
Ausgust - Awst
September - Medi
October - Hydref
November - Tachwedd
December - Rhagfyr

********************************

Scottish Gaelic

January - An Faoilteach
February - An Gearran
March - An Màrt
April - An Giblean
May - An Ceitean
June - An t-Òg-mhios
July - An t-luchar
August - An Lùnasdal
September - An t-Sultain
October - An Dàmhair
November - An t-Samhain
December - An Dùbhlachd

********************************

Cornish (a Celtic language spoken in the county of Cornwall in England)

January - Mys Genver
February - Mys Whevrer
March - Mys Merth
April - Mys Ebrel
May - Mys Me
June - Mys Metheven
July - Mys Gortheren
August - Mys Est
September - Mys Gwyngala
October - Mys Hedra
November - Mys Du
December - Mys Kevardhu

(Breton is almost exactly the same)
********************************

Czech

leden
únor
březen
duben
květen
červen
červenec
srpen
září
říjen
listopad
prosinec
******************************

Mongolian

nägdügäär sar
ĥojordugaar sar
guravdugaar sar
dörövdügäär sar
tavdugaar sar
dzurgadugaar sar
doldugaar sar
najmdugaar sar
jesdügäär sar
aravdugaar sar
arvan nägdügäär sar
arvan ĥojordugaar sar

****************************

Tibetan (slightly different from English)

January - zla.daṅ.po
February - zla.gñis.pa
March - zla.gsum.pa
April - zla.bži.pa
May - zla.lṅa.pa
June - zla.drug.pa
July - zla.bdun.pa
August - zla.brgyad.pa
September - zla.dgu.pa
October - zla.bču.pa
November - zla.bču.gčig.pa
December - zla.bču.gñis.pa

*****************************

Korean

January=1월 (Il-Wol)
February=2월 (I-Wol)
March=3월 (Sam-Wol)
April=4월 (Sa-Wol)
May=5월 (O-Wol)
June=6월 (Yu-Wol)
July=7월 (Chil-Wol)
August=8월 (Pal-Wol)
September=9월 (Gu-Wol)
October=10월 (Shi-Wol)
November=11월 (Shibil-Wol)
December=12월 (Shibi-Wol)

***************************

Burmese

January - zãnáwaẏi
February - pʰepʰɔwaẏi
March - maʿ
April - epẏi
May - me
June - zũ
July - zulaĩ
August - ɔ̀gouʿ
September - seʿtĩbʰa
October - auʿtobʰa
November - nowĩbʰa
December - dizĩbʰa
****************************

Vietnamese

tháng một
tháng hai
tháng ba
tháng tư
tháng năm
tháng sáu
tháng bảy
tháng tám
tháng chín
tháng mười
tháng mười một
tháng mười hai

****************************

In Irish

Eanáir
Feabhra(Faoilleach)
Márta
Aibreán
Bealtaine
Meitheamh
Iúil
Lúnasa
Meán Fómhair
Deireadh Fómhair
Samhain
Nollaig

****************************

Chinese:

January 一月
February 二月
March 三月
April 四月
May 五月
June 六月
July 七月
August 八月
September 九月
October 十月
November 十一月
December 十二月

****************************

Japanese Month Names
月の和名の一覧

睦月（むつき）／正月（しょうがつ）
如月（きさらぎ）
弥生（やよい）
卯月（うづき）
皐月（さつき）
水無月（みなづき）
文月（ふづき）
葉月（はづき）
長月（ながつき）
神無月（かんなづき）
霜月（しもつき）
師走（しわす）／極月（ごくげつ）

****************************
In Filipino

January - Enero
February - Pebrero
March - Marso
April - Abril
May - Mayo
June - Hunyo
July - Hulyo
August - Agosto
September - Setyembre
October - Oktubre
November - Nobyembre
December - Disyembre

****************************
Dutch:

Januari - January
Februari - February
Maart - March
April - April
Mei - May
Juni - Juni
Juli - July
Augustus - August
September - September
Oktober - October
November - November
December - December

****************************
Turkish

1-Ocak
2-Şubat
3-Mart - foreign
4-Nisan
5-Mayıs - foreign
6-Haziran
7-Temmuz
8-Ağustos - foreign
9-Eylül
10-Ekim
11-Kasım
12-Aralık

VIA