Thomasa
The feminine form of Thomas, meaning "twin" or "a twin".
Name Census estimates that about 231 living Americans carry the first name Thomasa. The name is used almost exclusively for girls. The average person named Thomasa today is around 58 years old, and the year with the single highest number of Thomasa births was 1961 (20 babies).
This page is the full Name Census profile for Thomasa. Below you will find a gender breakdown showing how the name splits between male and female registrations, a year-by-year popularity chart stretching back to 1880, decade-level totals, the top US states for this name, its meaning and etymology, and a set of frequently asked questions with data-backed answers.
People living today
231
~ 1 in 1,483,785 Americans
Peak year
1961
20 babies that year
Average age
58
years old
1992 SSA rank
#15,414
Tracked since 1921
Popularity
Thomasa: popularity over time
The SSA tracks Thomasa from the 1920s through to the 1990s, spanning 8 decades of birth certificate data. The biggest single decade for the name was the 1960s, with 125 total registrations. Usage has dropped considerably from its 1960s peak. The most recent decade brought in only a fraction of the registrations that the name once attracted.
Babies born per year
Decades
Thomasa by decade
The table below breaks the full SSA timeline into ten-year windows. Each row shows how many male and female babies were given the name Thomasa during that decade, along with a combined total. This is useful for spotting eras where the name surged or retreated.
Geography
Where Thomasas live
Origin
Meaning and history of Thomasa
Thomasa is a feminine given name derived from the Greek name Thomas, which means "twin" or "non-identical twin." The name has its roots in the Aramaic/Syriac language and can be traced back to the biblical figure of Thomas the Apostle, one of the twelve disciples of Jesus Christ.
The name Thomasa gained popularity during the Middle Ages, particularly in regions with strong Christian influence, such as Italy, Spain, and parts of France. It was often bestowed upon girls born as twins or in close succession to a sibling, reflecting the meaning of the original Greek name.
One of the earliest recorded instances of the name Thomasa can be found in the writings of the 12th-century Italian scholar and philosopher, Peter Abelard. In his work "Historia Calamitatum," he mentions a woman named Thomasa who was a member of the religious order at the Paraclete Abbey.
Throughout history, several notable women have borne the name Thomasa. One of the most prominent was Thomasa de Aquino (1225-1274), an Italian Roman Catholic nun and mystic who was a member of the Dominican Order and is recognized as a Blessed by the Catholic Church.
Another noteworthy figure was Thomasa von Bayern (1450-1503), a German princess and the daughter of Albert III, Duke of Bavaria. She played a significant role in the politics and diplomacy of her time and served as the regent of the Duchy of Bavaria-Munich during the minority of her son, William IV.
In the 16th century, Thomasa de Borja (1537-1592), a Spanish noblewoman and a member of the House of Borgia, gained recognition for her religious devotion and charitable works. She established a convent in Valencia and was later beatified by the Catholic Church.
The name Thomasa also found its way into the literary world with the character of Thomasa Panza, the wife of Sancho Panza, in Miguel de Cervantes' iconic novel "Don Quixote de la Mancha," published in the early 17th century.
Another notable bearer of the name was Thomasa von Lichtenfels (1694-1778), a German abbess and author who served as the Princess-Abbess of the Imperial Abbey of Quedlinburg in present-day Saxony-Anhalt, Germany.
People
Thomasa + last name combinations
How many people share a full name with Thomasa as the first name? Click a combination below to see the estimate, or search any pairing.
Related
Other names starting with T
Other first names starting with T with a similar number of bearers.
FAQ
Thomasa: questions and answers
How many people in the U.S. are named Thomasa?
Name Census puts the figure at roughly 231 living Americans. We arrive at this by taking every SSA birth registration for Thomasa going back to 1880 and adjusting each cohort for expected survival using CDC actuarial life tables. The result is an age-weighted living-bearer count, not a raw birth total. That works out to about 1 in 1,483,785 US residents.
Is Thomasa a common name?
We classify Thomasa as "Very Rare". It ranks above 76.1% of all first names in the SSA dataset by living bearers. Across the full history of the data, 304 babies have been registered with this name.
When was Thomasa most popular?
The single biggest year for Thomasa was 1961, when 20 babies received the name. The fact that the average living Thomasa is about 58 years old gives you a rough sense of which era contributed the most bearers who are still alive today.
Is Thomasa a female name?
Yes, 100.0% of people registered as Thomasa in the SSA data are female. You can see the full per-sex comparison in the gender distribution section above, which includes the latest year rank, birth count, and peak year for each sex.
Where does this data come from?
First-name figures come from the Social Security Administration's national baby name files, which cover every name on a birth certificate from 1880 to 2024. Living-bearer estimates layer in CDC actuarial life tables broken out by sex to account for mortality. The population baseline (342,754,338) is the Census Bureau's latest national estimate. You can read the full calculation on our methodology page.