NAMES column of "docker ps" output

Below is the docker file:

FROM golang:1.14.10

MAINTAINER xyz

ENV SOURCES /product-api

COPY . ${SOURCES}

WORKDIR /product-api

RUN make swagger

ENTRYPOINT product-api

After running commands:

$ docker build -t cloud-native-product-api:1.0.0 .

$ docker run -it -p 8080:8080 cloud-native-product-api:1.0.0


docker ps gives below output:

$ docker ps -a
CONTAINER ID        IMAGE                            COMMAND                  CREATED             STATUS              PORTS                    NAMES
9aa144b7873c        cloud-native-product-api:1.0.0   "/bin/sh -c product-…"   3 minutes ago       Up 3 minutes        0.0.0.0:9090->9090/tcp   trusting_matsumoto

Where does value trusting_matsumoto derive from in NAMES column?

Source: Docker Questions