Where does “Ptolemeu” come from?

Ptolemeu (Portuguese) comes from Vulgar Latin Ptolemeus, from Latin Ptolemaeus, from Latin -us, from Old Latin -os, from Proto-Italic -os, from Proto-Indo-European -ós — Creates agent nouns from verb stems, denoting...

Ptolemeu (Portuguese): Ptolemy Ptolemy I Soter, founder of the Ptolemaic dynasty of Egypt

Definitions

Ptolemy Ptolemy I Soter, founder of the Ptolemaic dynasty of Egypt

Ancestry of “Ptolemeu”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	Ptolemeus	—
2	Latin	Ptolemaeus	Ptolemy
3	Latin	-us	suffix forming adjectives from nouns, verbs,...
4	Old Latin	-os	accusative masculine plural of -us
5	Proto-Italic	-os	—
6	Proto-Indo-European	-ós	Creates agent nouns from verb stems, denoting...

Every word from Proto-Indo-European -ós →Every word from Latin -us →Every word from Latin Ptolemaeus →