Aymer (a variant of Ademar) is a given name and a surname. Notable people with the name include:
Aymer, Count of Angoulême (c. 1160–1202), count of Angoulême in France Aymer II of Angoulême (died 952), count of Angoulême in France Aymer de Valence (bishop) (c. 1222–1260), English bishop Aymer Edward Maxwell (1877–1914), son of British horticuralist and genealogist Sir Herbert Maxwell, 7th Baronet Aymer de Valence, 2nd Earl of Pembroke (c. 1270–1324), Anglo-French nobleman Henriette Aymer de La Chevalerie (1767–1834), French religious sister