Bitcoin's blocksize limit is currently 1MB. It seems as if Namecoin would have to be bigger due to it proving 512 bytes of storage with a name update, but it also has slower average block times (about 20 minutes according to BitInfoCharts).

Does Namecoin also have block size limit? What size is it?

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Namecoin has not strayed from Bitcoin in this parameter, it is still set at a 1 MB block size limit. You can find it in main.h:

/** The maximum allowed size for a serialized block, in bytes (network rule) */
static const unsigned int MAX_BLOCK_SIZE = 1000000;

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