[3][4][5] Decugis' father was a merchant at Les Halles, the company's name was Omer Décugis et fils,[6] however the accent mark on the é is missing from Max Decugis' birth certificate, and appears inconsistently in later English-speaking sources such as the Ayres' Almanacks edited by Arthur Wallis Myers, but apparently never in any French-speaking sources.

The origin of the family name Décugis, spelled with accented é in an 1842 source, is "from Cuges-les-Pins.

[8] After the death of Marie in 1969, Max married Suzanne Louise Duval in October.

The interruption of World War I denied Decugis the opportunity to defend his 1914 title.

He won the mixed doubles title at the WHCC on four occasions (1912, 1913, 1914, 1921) and at the WCCC on two (1913, 1919).