Maxamillion is almost certainly an alternate spelling of Maximilian, a name with a grand Renaissance pedigree (Holy Roman Emperor Maximilian I, among others), but with a phonetic substitution that makes the spelling look like someone heard the name rather than read it. On a pet this produces a particular charm: the dog is named Maxamillion, a name with imperial weight and a spelling that keeps it grounded in the everyday. The working name is Max, always.
Registry Artifact and Naming Intention
Maxamillion in pet licensing data likely reflects oral transmission of a name the owner heard or loved but spelled phonetically. This is common enough in large municipal datasets that Worth flagging. The intent is the Latin/Germanic Maximilian lineage; the execution is the owner's own version. Both the intended name and the recorded variant are warm. The dog named either is almost certainly called Max by Thursday.
Sound and Nickname
The full name, five syllables, is strictly ceremonial. Max is the functional name: one syllable, hard consonant onset, excellent recall command. Large dogs receive this name most: Great Danes, German Shepherds, and Rottweilers are natural recipients. A tiny dog named Maxamillion achieves irony by geometry.
The Counter-Reading: The Spelling Is a Liability
Maxamillion will be corrected or questioned every time it appears in writing. Owners who want the full Maximilian gravitas on the record should use the conventional spelling: Maximilian is the registered historical form and requires no explanation at the veterinary desk.