BabyNamesMap

Baby names › Boys

Theo

Meaning not yet sourced

Editor’s note Climbing fast in the US: #405 in 2015, #82 in 2025

CommonRare
Rank 2015: #405, 2016: #354, 2017: #290, 2018: #243, 2019: #195, 2020: #172, 2021: #142, 2022: #98, 2023: #78, 2024: #80, 2025: #821 in 433 boys in the US, 2025#82 · rising · was #405 in 2015
CommonRare
Rank 2015: #33, 2016: #29, 2017: #21, 2018: #19, 2019: #16, 2020: #17, 2021: #15, 2022: #9, 2023: #11, 2024: #12, 2025: #121 in 113 boys in E&W, 2025#12 · rising · was #33 in 2015

Boy’s name · Greek · /ˈθiːəʊ/

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What Theo means

Meaning not yet sourced. Wiktionary has no word-by-word meaning for Theo yet, and we don’t write our own.

Editor’s note Climbing fast in the US: #405 in 2015, #82 in 2025 Worked out from the official US and England & Wales counts, not a meaning.

How popular is Theo?

US 2025
#82
3,945 babies
▼ 2 vs 2024
England & Wales 2025
#12
2,398 babies
same as 2024
Scotland 2025
#6
243 babies
▼ 2 vs 2024

US: Rising: up from #405 in 2015. England & Wales: Rising: up from #33 in 2015.

02.557.51018801920196020002025
US, 1880–2025England & Wales, 1996–2025Babies per 1,000 boys born. Dot: biggest US share (2023)

Biggest US share so far: 2023, when 4,140 boys got the name (#78 that year). First in the US records in 1880.

How common

  • About 1 in 433 baby boys in the US in 2025
  • About 1 in 113 baby boys in England and Wales in 2025
  • About 1 in 81 baby boys in Scotland in 2025

“1 in N” divides by all listed births for that sex. The US list leaves out names given to fewer than 5 babies, and the UK lists leave out names given to 2 or fewer, so the real figure is a little rarer than shown.

Where in the US

Most popular in HI (7.88 per 1,000 boys), DC (5.54 per 1,000 boys), MA (5.11 per 1,000 boys) in 2025.

AK
ME
WI
VT
NH
WA
ID
MT
ND
MN
IL
MI
NY
MA
OR
NV
WY
SD
IA
IN
OH
PA
NJ
CT
RI
CA
UT
CO
NE
MO
KY
WV
VA
MD
DE
AZ
NM
KS
AR
TN
NC
SC
DC
OK
LA
MS
AL
GA
HI
TX
FL
FewerMore · grey: under 5 babies, not listed

SSA state data, 2025. Share of all listed boys born in each state.

US vs UK

Theo is #82 in the US and #12 in England & Wales (2025).

Rank 2025BabiesHow commonRank 2015
US#823,9451 in 433#405
England & Wales#122,3981 in 113#33
Scotland#62431 in 81#69

Same sex as this page (boys). SSA (US), ONS (England and Wales), NRS (Scotland).

Boy or girl?

In 2025, 99.5% of US babies named Theo were boys.

GirlsBoys
US 2025213,945
England & Wales 202502,398
US all years since 18803,50335,830
England & Wales since 1996942,992

Counts below the publishing threshold (US 5, UK 3) are not included.

How to say it

UK/ˈθiːəʊ/
US/ˈθioʊ/

IPA from Wiktionary.

If you like Theo

Boys

  • Niko#325Editor’s note First shows up in US records in 1962, with 5 babies
  • Theodore#4Editor’s note Climbing fast in the US: #99 in 2015, #4 in 2025
  • Ambrose#735“immortal, divine”
  • Leon#138“lion”
  • Adonis#241Editor’s note Climbing fast in the US: #698 in 2015, #241 in 2025
  • Azariah#472“Yah Has Helped”

For a sister

  • Iris#61“rainbow”
  • Ophelia#264possibly “help, aid, succour”
  • Elena#42Editor’s note Climbing fast in the US: #106 in 2015, #42 in 2025. 5 letters, starting with a vowel
  • Athena#109Editor’s note Up from #157 in 2015 to #109 in 2025 in the US
  • Cleo#577Editor’s note Climbing fast in the US: #1,743 in 2015, #577 in 2025
  • Rhea#639Editor’s note Up from #994 in 2015 to #639 in 2025 in the US

Picked from the US top 1,000 in 2025: names Wiktionary also files under Greek, whose US popularity since 1990 rose and fell most like Theo’s. Rank is US 2025.

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