MallowbyNames

Kastiel

KAS-tee-el · Of uncertain origin; possibly a modern coinage or variant of Castiel.

2025 rank (boys)
#6,143
Babies named in 2025
14
Peak popularity
2021
2025 frequency
1 in 122,005 boys
Usually for
Boys
Trend
Declining since 2020

Declining since 2020, #6,143 for boys today.

Popularity of Kastiel since 2012

Babies named Kastiel per year in U.S. Social Security records.

1019292020Most births 2021Boys
Data table (by decade)
DecadeBoys
2010s118
2020s99

Meaning & origin

Kastiel is a modern American invention, first appearing on U.S. birth records in 2012. The spelling with a 'K' reflects a broader trend of stylized respellings. The name's popularity peaked in 2021, and its trajectory has been falling since 2020. Though it resembles the angelic name Cassiel, no direct connection has been established. Despite a low overall rank of 6,143 in 2025, with a frequency of 1 in 122,005 births, Kastiel remains a distinctive choice for parents seeking a name with contemporary flair and subtle fantastical undertones.

Kastiel first appeared in U.S. records in 2012. It is likely a respelling of Castiel, a name that gained exposure through the television character Castiel from Supernatural (2008-2020). The spelling with 'K' follows a trend of substituting 'C' with 'K' for a distinct look. No traditional etymology or meaning is attested.

Nicknames & variants

Nicknames: Kas, Kast, Kiel

Variants: Castiel

Sibling names for Kastiel

Names that share Kastiel's style, for a brother or sister.

Sisters: Kaelia, Kiana, Elara, Sera, Mira

Brothers: Kael, Dorian, Silas, Archer, Kai

A parent animal hugging its little one, the personalized name page

K is for Kastiel, our favorite little boy.

K is for Kastiel…”

In a Mallowby alphabet book, Kastiel's letter becomes Kastiel's page: hand-illustrated, printed hardcover or paperback, made just for them.

Make Kastiel's book

Books for siblings or grandkids? The second book is 15% off.

Questions parents ask

What does Kastiel mean?
Kastiel does not have a traditional meaning; it is a modern respelling of Castiel, a name of uncertain origin possibly related to the angel Cassiel.
Is Kastiel a popular name?
Kastiel is uncommon. In 2025 it ranked 6,143 in the U.S., given to roughly 1 in 122,005 newborns. Its highest rank was in 2021.
Is Kastiel a boy or girl name?
Kastiel is predominantly used as a boy's name.