Liam doesn't appear to have been a period diminutive of Uilleam. All the sources that cite Liam do so as a modern diminutive; the period diminutive was Uillec. Without evidence of period use, we can't register Liam. (Uilleam Catach ó Maoilbhreanainn, July, 1992, pg. 24)
Janie appears to be a valid period diminutive of Jane, as Janny is from Jan (Reaney & Wilson 252) (Janie Fairchild, August, 1993, pg. 9)
John is not the same name as Jonathan, nor its diminutive [therefore they do not conflict with each other]. (Jonathan ap Morgan, September, 1993, pg. 3)
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