Dictionary.net

• tek-non'i-mi, n. the naming of the parent from the child.--adj. TEKNON'YMOUS. [Gr. teknon, a child, onoma, a name.]

1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson

• Practice of naming parent from child. So teknonymous a. [Greek]

1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry