周一到周日的名字英文的大多来源于神话中的神的名字和圣经Monday来源于Mona，日耳曼的月神Tuesday来源于日尔曼神Tyr，大神奥丁的儿子Wednesday，来源于日尔曼主神Woden，即大神奥丁（Odin）Thursday，来源于日尔曼的风雨雷电之神ThorFriday，来源于日尔曼的爱与美的女神，大神奥丁的妻子FriggSaturday，可能来源于土星，安息日Sunday，来源于“太阳日”；主的日子古巴比伦人创立的星期制，首先传到古希腊、古罗马等地。
古罗马人用他们自己信仰的神的名字来命名1周7天：Sun’s-day（太阳神日）、Moon’s-day（月亮神日）、Mars's-day （火星神日）、Mercury's-day（水星神日）、Jupiter’s-day（木星神日）、Venus’-day（金星神日）、Saturn’s-day（土星神日）。
这7个名称传到不列颠后，盎格鲁-撒克逊人又用他们自己信仰的神的名字改造了其中4个名称，以Tuesday、Wednesday、Thursday、Friday分别取代Mar's-day、Mercury's-day、Jupiter's-day、Venus'-day。
Tuesday来源于Tiu，是盎格鲁-撒克逊人的战神；Wednesday来源于Woden，是最高的神，也称主神；Thursday来源于Thor，是雷神；Friday来源于Frigg，是爱情女神。
这样就形成今天英语中的1周7天的名称：Sunday（太阳神日，即星期日），Monday（月亮神日，即星期一），Tuesday（战神日，即星期一），Wednesday（主神日，即星期三），Thursday （雷神日，即星期四），Friday（爱神日，即星期五），Saturday（土神日，即星期六）。
英语中表示一周七天的每个词都是由北欧或罗马神话中的神名来命名的。
In English, Every word of week is name after the Nordic’s or the myth of Rome’s god.Sunday 星期日：Sunday在古英文中的意思是sun's day(属于太阳的日子)。
对基督徒而言, 星期日是「安息日」, 因为耶稣复活的日子是在星期日。
约从公元4世纪起，罗马天主教会就将Sunday定为假日，在这一天禁止任何人工作，教徒都得停止一切娱乐活动，上教堂去做礼拜。
直到今日, 世界上大多数的国家都以Sunday为星期例假日。
Sunday is the meaning of the sun 's day (belong to the day of the sun) in Old English. For christians, Sunday is "the Sabbath", because Sunday isthe day of Jesus' resurrection. Form the 4 th century on, the Roman Catholic church treat Sunday as a holiday, on this day, forbiding anyone to work, muslims have to stop all entertainment activities and go to church. Now, most of the world's countries treat Sunday as the week holiday.Monday 星期一：在古罗马神话中，Monday的意思是moon day(属于月亮的日子), 因为西方人把这一天献给月之女神。
古时候西方人相信, 月的盈亏会影响农作物的生长, 也会影响医疗。
此外, 尚有所谓的Blue Monday。
Blue是「忧郁」的意思。
星期一是一周工作的开始, 没得玩了, 所以心情不好, 不少国家将星期一当作family washday(家庭洗濯日), 那是由来已久的习俗。
In the ancient Roman mythology, Monday mean moon day (belong to the moon day), because westerners contribute this day to thegoddess.Westerners believe that the month of profit and loss will affect the growth of crops and also can affect health in ancient times, In addition, there is the so-called Blue Monday. Blue means "heavyhearted ". Monday is the beginning of a week, didn't get to play and in a bad mood, many countries will Monday as a family washday (family washing day), it is a custom.Tuesday 星期二：这一天是为了纪念战神Tyr而由他的名字命名的。
古英语中Tyr的名字写作Tiw。
Tiwesdoeg的意思是Tiw’s day（战神日），它是由拉丁语dies Martis(即day of Mars)翻译而成的。
Tyr原是北欧神话里的战神，也是盎格鲁—撒克逊人的神。
他用自己的手作诱饵，捉住了狼精，他的手却被狼精咬掉了。
为了纪念他这种勇敢的精神，使用他的名字来命名Tuesday这一天。
This day is name after Tyr and for in memory of this god of war.In oldEnglish Tyr name Tiw in writing. Tiwesdoeg mean Tiw 's day (Mars day), it translates by the Latin of dies Martis (day of Mars) Tyr is god of war in Nordic mythology and also is the Anglo-Saxon-Saxon god. He used his own hand as bait, caught the Wolf essence, his hand was bite by Wolf fine. In order to commemorate him this brave, use his name to name the day Tuesday.Wednesday 星期三：Wednesday在古英文中的意思是Woden's day。
Woden是北欧诸神之父。
为制服狼精而牺牲自己一只手的Tyr, 就是他的儿子。
Woden领导神族跟巨人族作战, 他曾牺牲自己锐利的右眼, 跟巨人族换取「智能」的甘泉。
他也曾深入地层, 从巨人族那里偷取「诗」的美酒。
西方人为了追念这位主神, 就根据他的名字创造了Wednesday这个字。
Wednesday is the meaning of the Woden 's day in the Old English. Woden is the father of northern Europe god. and Tyr who losed one handfor wining the Wolf fine is his son. Woden leader the protoss combating with giants, he scarified his sharp right eye in return for "smart" wilderness with giants. He also had gone to strata and there stealed the wine of "poem" from the giants., According to his name. Westerners created Wednesday the word in order to remember the Lord god. Thursday 星期四：Thursday在古英文中意思是Thor's day。
Thor是北欧神话中的雷神, 经常带着一把大铁锤。
相传有一次, 他的大铁锤被一位叫Thrym的巨人偷走了。
Thrym 扬言, 除非神族答应把美丽的爱神Freya嫁给他做为交换。
然而Freya抵死不从, 于是神族想了一个办法, 由Thor男扮女装穿Freya的衣服, 假装嫁给他, Thrym不疑有诈, 把铁锤交给新娘。
于是Thor抢回了自己的武器, 也立即把Thrym 给杀了。
In old English Thursday means the Thor 's day. Thor is the Thor of Nordic mythology and often carried a big hammer. For once, his great hammer is stolen by Thrym giant. Thrym threatened that unless the protoss of god promised to put the beautiful love god Freya marry him in exchange. However, Freya didn’t agree , so the protoss had an idea, Thor who dressed up like a woman wear Freya clothes and pretend to marry him, Thrym don't doubt and hand the hammer to the bride. So the Thor rob back his weapons and immediately killed the ThrymFriday 星期五：Friday在古英文中意思是Frigg's day。
Frigg是北欧神话中主司婚姻和生育的女神, 也是Woden的妻子。