ラテン語のlocusta, lobster, locustが語源で、語源的にはlocust, langoustineと同じ。 locustと区別するためにlobsterとスペルミス、または意図的なもの。
Sir William Waller having received from London [in June 1643] a fresh regiment of five hundred horse, under the command of sir Arthur Haslerigge, which were so prodigiously armed that they were called by the other side the regiment of lobsters, because of their bright iron shells with which they were covered, being perfect curasseers. [Clarendon, "History of the Rebellion," 1647]