Quenya 

atamir

noun. heirloom

A noun for an “heirloom” appearing in notes from around 1959-60, where the second element is mírë “precious thing” (PE17/165). Lokyt suggested the first element might be connected to √AT(AR) “father”. Tolkien also indicated atamir had the same meaning as Old English máþum, which was a “treasure, precious thing, gift”.