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```const istioNamespace = new k8s.core.v1.Namespace(istioNamespaceName, {
  metadata: {
    name: "istio-system
  }
});```

you need to explicitly define the namespace name

then
```const istioBase = new k8s.helm.v3.Chart("istio-base", {
    chart: "base",
    version: istioVersion,
    namespace: istioNamespace.metadata.name,
    fetchOpts: {
        repo: "<https://istio-release.storage.googleapis.com/charts>",
    },
}, {
    dependsOn: istioNamespace
});```
To reference it

Thank you <@UCWG26BH7>! This is exactly what I was looking for, but couldn't find it in the docs!

in general, if any resource has a property that lets you assign it a name and it's left blank, pulumi will generate the name based on the pulumi resource name appended with some random characters.