Monday's Child: Birth Day Meaning & Poem

Born on a Monday, your birthday shares its name with the moon in more languages than almost any other weekday manages to agree on. “Moon day” is one of the rare weekday names that translated cleanly across cultures and mostly stayed that way for two thousand years.

Where the name Monday comes from

The Romans named the second day of their week dies Lunae, “day of the moon,” after Luna, their moon goddess. The Anglo-Saxons translated it rather than borrowed it, giving Old English Mōnandæg, “moon’s day,” from mōna (“moon”) and dæg (“day”). That compound became modern “Monday.”

What’s genuinely unusual is how consistently this one held up. French lundi, Spanish lunes, Italian lunedì, and German Montag are all still literally “moon day,” a rare case of near-total agreement across languages that otherwise disagree constantly about weekday names. Sunday and Monday are the two days that kept a direct sun-or-moon meaning; the other five all ended up naming a god instead once you trace them back far enough.

The Monday’s Child rhyme for Monday

Monday opens the Monday’s Child rhyme, which is also why English speakers use its name as the title for the whole poem:

Monday’s child is fair of face, Tuesday’s child is full of grace,

The rhyme was first widely printed in the 1830s, in A. E. Bray’s Traditions of Devonshire (commonly dated 1838), collecting an oral tradition that was almost certainly older. Monday’s “fair of face” has stayed relatively stable across the versions folklorists have gathered since; it’s Wednesday’s and Friday’s fortunes that tend to swap places in older print editions.

Monday’s other job: starting the week

Outside the nursery rhyme, Monday carries real administrative weight. The international ISO 8601 date standard, the one behind most computer systems and the ISO week-numbering calendars used across Europe, fixes Monday as day one of the week. That’s a different convention from the common American wall calendar, which usually prints Sunday first. Neither is more “correct”; they’re just two different standards answering the same question differently, and it’s worth knowing which one a calendar app is using before you trust its week numbers.

Folklore vs the calendar

None of that history changes the arithmetic. Whether you land on a Monday is decided by the Gregorian calendar, not by rhyme or convention. Our methodology page explains how this site builds your birth date locally in the browser before reading the weekday, the detail that keeps a birth date from silently sliding to the previous day on a UTC-based calculator.

Other weekdays

Loop back to Sunday’s child, bonny and blithe, or move ahead to Tuesday’s child, full of grace. Browse every day on the weekdays hub.

Find your birth weekday

Enter your date in the birthday calculator to see whether you were born on a Monday, alongside age, moon phase, zodiac labels, and milestones.