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Dictionary of Medieval Names
from European Sources

Azo m. A hypocoristic of any of various names beginning with Old High German adal 'noble'.

The double diminutive Ascelin outstripped the root form in popularity by the 12th C or so.

France
Latin
1047 Azonis (gen) CartNDSaintes II; 1138x1162 Aszo (nom) clairvaux-12thc 61
1029x1033 Ascelinus (nom) CartStPC XII; 1115 Acelino (abl) CartNDJosaphat V; 1147 Acelinus (nom) clairvaux-12thc 19, Ascelini (gen) ibid. 19, Ascelinus (nom) ibid. 18; 1180 Ascelino (abl) RotScaNor p. 11; 1378 Ascelino (dat) hanquetvol1 551
Germany
Latin
948 Azzonis (gen) HambUrk-vol1 XXXV; 1020 Azo (nom) quix-vol1 58
Cite as: S.L. Uckelman. "Azo". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 2. http://dmnes.org/2015/2/name/Azo.