I don't think Ecthelion's name would be Sindarin. Since he was an elf of Gondolin, his name was probably Noldorin.
Earendil's name was said to be of a speech unique to the Gondolhrim, (I think it is mentioned in the fall of Gondolin), perhaps the name Ecthelion was also of that language.
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His sword was long his lance was keen
His shining helm afar was seen
The countless stars of heavens field
Were mirrored in his silver shield
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