Aggie

Aggie is also used in Dutch as a diminutive of Agatha and Agnes. Like most diminutives, it's primarily used informally, i.e. rarely as an official name on birth certificates:

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• https://nvb.meertens.knaw.nl/naam/is/Aggie (in Dutch; shows the prevalence of the name in the Netherlands in 2017)
• (general): https://www.linkedin.com/pub/dir/?first=Aggie&last=&search=Zoeken
• https://www.facebook.com/search/people?q=aggie
• Agatha "Aggie" van der Meer (1927-2023): https://nl.wikipedia.org/wiki/Aggie_van_der_Meer (in Dutch)
• Agnes "Aggie" Labouchere (1925-2012): https://nl.wikipedia.org/wiki/Aggie_Labouchere (in Dutch)
• Agnes "Aggie" Terlingen (b. 1949): https://nl.wikipedia.org/wiki/Aggie_Terlingen (in Dutch)
• obituary of Agatha "Aggie" Woolderink-Leeuw (1939-2023): https://mensenlinq.nl/overlijdensberichten/agatha-maria-catharina-%28aggie%29-woolderink-leeuw-711188 (in Dutch)
• obituary of Agnes "Aggie" Welkers-Koomen (1933-2024): https://mensenlinq.nl/overlijdensberichten/agnes-antonia-maria-%28aggie%29-welkers-koomen-602267 (in Dutch)

Aggie is also the nickname for students and alumni of various land-grant colleges in the United States (from "agriculture"), most notably Texas A&M University.

This could be a nickname for Augusta, Augustine, Augustina and Agrippina.