Fricis is not a short form of Fritz, rather it is the Latvian spelling of Fritz. The old records were kept mostly in German and Russian, and even the rare records that are in Latvian still use German spelling rules (since Latvian spelling wasn't standardized until the 1920s). Standardized Latvian spellings have most male names with an "s" or "is" ending.
Other examples:
Mikkel, Mikel -> Miķelis Mahrt, Marz, -> Mārts, Marcis Martin -> Mārtiņš Jahn, Jan, Janne -> Jānis Peter -> Pēteris Jeannot, Zhanno -> Žanis Ans, Hans -> Ansis Carl, Karl -> Kārlis Dahw, Dahwe -> Dāvis Paul, Pavel -> Paulis, Pāvils
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