Read the following paragraph and extract the answer for the question: What city name does the "cor" in "Elcor" come from?

A small Methodist church and Presbyterian church were built. The town also had a night watchman and later a full-time patrolman. Always noted as a quiet, orderly town, Elcor managed to avoid the social vagaries of adjacent communities, like Gilbert's red-light district.One of the frame houses was used as the first school in Elcor. It was not long before a new school was constructed. Elcor was included in the middle part of the Gilbert School system, known then as Independent School District No. 18. There were five schoolhouses in the district. The McKinley-Elba school was built in 1900, halfway between McKinley and Elba, complete with its own well and windmill. It had four teachers and housed classes through the eighth grade, accommodating pupils of both communities. Students walked to school over boardwalks. There were also three primary schools in the district, one of them in Elba on Malta Street.Elcor's renters were required to take in boarders. The company rented a "cottage" for $7.50 per month, which later included electricity. Homes were charged an additional dollar per month when water was piped in from Gilbert. Although people were later allowed to own their homes (even though the land on which the houses stood belonged to the mining company), rents were never increased.All families had their own gardens in which they grew vegetables that lasted through the winter. Some raised cows, pigs, and chickens; others had horses for carrying firewood. There was little refrigeration, and perishables were difficult to keep. Before the Mercantile came to Elcor, residents went to the J. P. Ahlin store in McKinley, or to the Saari, Campbell and Kraker Mercantile in Gilbert. Deliveries were made daily, with orders taken for the following day. People bought on credit and paid monthly, on paydays.In 1920, the Finnish Hall became a general store, the Elcor Mercantile, along with an official U.S. Post Office. When the post office began operation, much confusion resulted, because there was another town named Elba in...
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