Mamoru
Meaningto protect · Japanese
Mamoru is a Japanese boy name meaning “to protect”. In Japan, parents often choose a name as much for the kanji characters behind it as for its sound, so the same name can carry several shades of meaning. A meaning like this gives a child something to grow into, and a good story to tell when someone asks about their name. It sounds flowing and melodic, it's simple to spell and say, and it pairs well with a short middle name.
Did you know?
- GenerationMamoru peaked in 1926, which makes it a Greatest Generation name, think great-grandparents.
- HistoryMamoru first shows up in US birth records in 1915, the first year at least 5 babies got it. It has been in use for 110 years since.
Save adds it to your list. Vote moves it up the top voted names.
Popularity: U.S. Social Security Administration (babies with 5+ births per year).
About the name Mamoru
Mamoru is a boy name of Japanese origin meaning “to protect”. With 3 syllables it has a flowing, lyrical sound, so a short middle name balances it nicely. It was most fashionable in the 1920s, which gives it a vintage, grandparent-chic charm. It's rarely heard today, so it stands out while still being a real, established name.
Origin:Japanese names
More Japanese boy names
- Unisex name: Asa · healer
- Unisex name: Rio · river
- Unisex name: Akari · light, brightness
- Boy name: Kenzo · often healthy third son
- Boy name: Kenji · often strong second son
- Unisex name: Ren · often lotus
- Unisex name: Zen · meditation
- Unisex name: Mars · god of war
Questions about the name Mamoru
What does the name Mamoru mean?
Mamoru means “to protect” and comes from Japanese. Other boy names with a similar meaning include Baltazar (“Bel protect the king”), Balthazar (“protect the king”) and Chizoba (“God protect us”).
What is the origin of the name Mamoru?
Mamoru is Japanese in origin. Other Japanese names to consider are Asa (“healer”), Rio (“river”), Akari (“light, brightness”) and Kenzo (“often healthy third son”).
Is Mamoru a boy or girl name?
Mamoru is a boy name.
How popular is the name Mamoru?
Mamoru is rare: fewer than 5 US boys got it in 2025, and it was last given to 5 or more in 1937. It peaked at #1,981 in 1926, so it's a name with history that few kids share today.
What names are similar to Mamoru?
If you like Mamoru, you might also like Baltazar, Balthazar and Chizoba.
What should I know before naming my baby Mamoru?
Mamoru is a Japanese boy name meaning “to protect”. In Japan, parents often choose a name as much for the kanji characters behind it as for its sound, so the same name can carry several shades of meaning. A meaning like this gives a child something to grow into, and a good story to tell when someone asks about their name. It sounds flowing and melodic, it's simple to spell and say, and it pairs well with a short middle name. Say it out loud with your last name and any middle names you're considering, and check the initials it makes.