The affix vuñ comes in the sense of 'thence come' after a word denoting a person connected through the relationship or family origin.,
Persons related (sambandha) through learning (such as teacher and pupil), or through blood (yoni, e. g. father and son) are called विद्यायोनिसम्बन्धाः ॥ Words denoting such persons take the affix वुञ्. This debars अण् and छ. Thus उपाध्यायादागतम् = औपाध्यायकम् 'knowledge derived from a spiritual teacher.' शैष्यकम्, आचार्यकम् ॥ So also योनिसंबन्धः as मातामहकः 'wealth derived from a maternal grand-father.' पितामहकः, मातुलकः ॥,