Namesakes
Belgian Prime Ministers:
2 prime ministers
Achille Van Acker (a.k.a. Achiel) 1945-1946; 1946; 1954-1958 
Wilfried Martens (middle name Achiel) 1979-1981; 1981-1992
Notable Athletes:
2 cycling
(cycling) Achiel Bruneel 1918-2008
(cycling) Achiel Buysse 1918-1984
Notable Musicians:
1 singer
Will Tura (middle name Achiel) 1940-