Indonesian names: single names and how to address someone
Indonesia has no single national naming system: many Javanese and Balinese people carry only one name with no separate family name, while Chinese-Indonesian, Sumatran and other regional traditions add surnames or patronymics. A one-word name on a passport or an email signature is normal and is not a shortened form of something longer. This guide covers single names, the honorifics used in Indonesian business writing, Balinese birth-order names that are shared across genders, and a safe fallback when gender is unclear.
Name order and structure
A large share of Indonesians, especially older generations from Java, have exactly one name with no family name at all: "Suharto" or "Sukarno" are complete names, not surnames. Younger and urban Indonesians increasingly use two or more names, but there is still no reliable assumption that the last word is a family name the way it would be in most of Europe. Chinese-Indonesian names typically keep a family name, often placed last in the Western style after a period of surname suppression under Suharto-era policy that has since eased.
Honorifics and titles in business email
Indonesian business correspondence commonly uses "Bapak" (Mr., literally "father") or "Ibu" (Ms./Mrs., literally "mother") before the name: "Bapak Joko" or "Ibu Siti". These are used even for younger professionals as a mark of respect and are not limited to older recipients. In English-language email, "Dear Mr./Ms. [name]," works, but using the full name with no title ("Dear Joko Widodo,") is a safe, common alternative, especially when the name has only one word and "Mr./Ms. [single name]" would feel abrupt.
Gender and names
Balinese names carry almost no gender information at all: birth-order names such as Wayan, Made, Nyoman/Komang and Ketut are given to the first, second, third and fourth child in a family regardless of gender, and are reused each generation. A Balinese "Wayan" could be male or female with no way to tell from the name alone. Javanese and other Indonesian given names vary widely in how strongly they lean male or female, and many are genuinely ambiguous to an outsider without local naming knowledge.
What to write when unsure
Given how often Indonesian names carry no gender signal at all, "Dear [full name]," with no title is not just a fallback but often the more accurate choice, particularly for Balinese birth-order names. "Bapak/Ibu [name]" together, used as a pair, is a polite written option in some contexts when the writer genuinely does not know, though a plain full-name greeting is simpler and equally acceptable.
Examples
Formal letter, gender known (male)
Dear Bapak Joko,
Formal letter, gender known (female)
Dear Ibu Siti,
Formal letter, single name, gender unclear
Dear Wayan,
Everyday email, first contact
Hi Wayan,
Names to try
Frequently asked questions
Why do some Indonesians have only one name?
It is a long-standing convention, especially among Javanese people: a single name with no separate family name is a complete legal name, not an abbreviation.
Is Wayan a male or female name?
Both. Wayan is a Balinese birth-order name given to the first child regardless of gender, so it carries no gender information on its own.
What honorific should I use for an Indonesian contact?
"Bapak" (Mr.) for a man or "Ibu" (Ms./Mrs.) for a woman before the name is standard and respectful, even for younger professionals.
Do all Indonesians follow the same naming system?
No. Javanese and Balinese conventions differ from Sumatran, Chinese-Indonesian and other regional traditions, so name structure varies a great deal across the country.