וַיִּקְחוּ פְלִשְׁתִּים אֶת–אֲרוֹן הָאֱלֹהִים, וַיָּבִאוּ אֹתוֹ בֵּית דָּגוֹן; וַיַּצִּיגוּ אֹתוֹ, אֵצֶל דָּגוֹן
“The Philistines took the ark of God and brought it into the temple of Dagon, where they positioned it beside Dagon” 1Sam 5:2
The name Dagon has been always associated with the fish like god which many try to depict as a merman–a half man, half fish. It is understood that the word דָּג-Dag-fish is incorporated into his name. However, this is probably a misunderstanding and the name is actually דָּגָן-Dagan-Grain.