He seems to be enumerated as "Charles" in the 1870 census.
"Michigan Births, 1867-1902," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:NQN4-G2S : 12 August 2019), Thomas Ludden in entry for John Ludden, ; citing , Kalamazoo, Kalamazoo, Michigan, Department of Vital Records, Lansing; FHL microfilm .
"United States Census, 1870", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHHY-XK1 : 19 March 2020), Thomas Ludden, 1870.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWSN-JP6 : 26 August 2017), Willie Ludden in household of Thomas Ludden, Kalamazoo, Kalamazoo, Michigan, United States; citing enumeration district ED 135, sheet 209A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,586.
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