No, if you previously registered a name on the Namecoin u/ namespace using either the Onename app or another registration method, then your name is already migrated to Blockstack. Your name is under the control of the same private key that controlled your name on Namecoin. Since Namecoin and Bitcoin use the same key format, we just converted your Namecoin public key into a Bitcoin address and associated the new registration with that address.
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