威爾士家譜和姓名中的父系成分,早期爲 map “兒子”,與蓋爾語 mac 同源。自17世紀起合併爲姓氏,並縮寫爲 P- 或 B-(Ap Rhys = Price, Ap Evan = Bevan, Bowen = Ap Owen 等)。
It is said that a Welshman who evidently was not willing to be surpassed in length of pedigree, when making out his genealogical tree, wrote near the middle of his long array of 'aps' — "about this time Adam was born." ["Origin and Significance of our Names," The Chautauquan, Oct. 1887-July 1888]