I think there are two possible answers. One is a small musical instrument that is often called a Jew's Harp. See the attached Link for a photo, description and history.
The other answer is the harp that is mentioned in Tehillim (Psalms) and was used by King David. We may assume that such harps were not used by Jews only, since they are mentioned before the beginning of the Jewish people (Genesis ch.4).
Guitar, Violin, Bass Guitar, Rhythm Guitar, Acoustic Guitar, Piano
bamboo Zither patteteg tongatong bamboo scrapers kubing (Jew's harp)
A Jew's Harp is a small piece of metal that fits in your mouth to make many different sounds and noises, where as a normal harp can be a very large string instrument.
It is played to entertain oneself, to put a child to sleep, or in the ritual courtship...the Mangayan Jew's harp is cut from thick-walled bamboo, used by both men and women.
called a jaws harp which is made from a bamboo
Mouth harp, also known as a jew's harp. One of the oldest known instruments.
The Jew's harp referred to in "To Kill a Mockingbird" is a musical instrument played by Scout in Chapter 14. It is a small, simple instrument that produces a twanging sound when plucked. In the book, it symbolizes the innocence and playfulness of childhood.
The Tagbanua people of the Philippines traditionally use the "bamboo tube zither," known as the "bamboo harp" or "bamboo instrument." This instrument is made from bamboo and features strings that are plucked to create melodic sounds, often used in cultural rituals and celebrations. The bamboo harp reflects the Tagbanua's connection to their environment and cultural heritage. It plays a significant role in their music and storytelling traditions.
There are a number of stores that sell the musical instrument known as a Jew's Harp. These stores include Amazon, the auction website eBay, Dan Moi and Didgeridoo Breath.
Banjo includes the letter J. A Jug is a musical instrument.
The kinaban is a musical instrument that is played not only in Mindoro but all over the Philippines. It is made of bamboo and is played with the mouth like an idiophone or jaws harp.
Jew's Harp